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Oozie Specification, a Hadoop Workflow System
The goal of this document is to define a workflow engine system specialized in coordinating the execution of Hadoop Map/Reduce and Pig jobs.
- Changelog
- 0 Definitions
- 1 Specification Highlights
- 2 Workflow Definition
- 3 Workflow Nodes
- 4 Parameterization of Workflows
- 5 Workflow Notifications
- 6 User Propagation
- 7 Workflow Application Deployment
- 8 External Data Assumptions
- 9 Workflow Jobs Lifecycle
- 10 Workflow Jobs Recovery (re-run)
- 11 Oozie Web Services API
- 12 Client API
- 13 Command Line Tools
- 14 Web UI Console
- 15 Customizing Oozie with Extensions
- 16 Workflow Jobs Priority
- 17 HDFS Share Libraries for Workflow Applications (since Oozie 2.3)
- 18 User-Retry for Workflow Actions (since Oozie 3.1)
- 19 Global Configurations
- 20 Suspend On Nodes
- Appendixes
- Appendix A, Oozie Workflow and Common XML Schemas
- Oozie Workflow Schema Version 1.0
- Oozie Common Schema Version 1.0
- Oozie Workflow Schema Version 0.5
- Oozie Workflow Schema Version 0.4.5
- Oozie Workflow Schema Version 0.4
- Oozie Workflow Schema Version 0.3
- Oozie Workflow Schema Version 0.2.5
- Oozie Workflow Schema Version 0.2
- Oozie SLA Version 0.2
- Oozie SLA Version 0.1
- Oozie Workflow Schema Version 0.1
- Appendix B, Workflow Examples
- Appendix A, Oozie Workflow and Common XML Schemas
Changelog
2016FEB19
- 3.2.7 Updated notes on System.exit(int n) behavior
2015APR29
- 3.2.1.4 Added notes about Java action retries
- 3.2.7 Added notes about Java action retries
2014MAY08
- 3.2.2.4 Added support for fully qualified job-xml path
2013JUL03
- Appendix A, Added new workflow schema 0.5 and SLA schema 0.2
2012AUG30
- 4.2.2 Added two EL functions (replaceAll and appendAll)
2012JUL26
- Appendix A, updated XML schema 0.4 to include parameters element
- 4.1 Updated to mention about parameters element as of schema 0.4
2012JUL23
- Appendix A, updated XML schema 0.4 (Fs action)
- 3.2.4 Updated to mention that a name-node, a job-xml, and a configuration element are allowed in the Fs action as of schema 0.4
2012JUN19
- Appendix A, added XML schema 0.4
- 3.2.2.4 Updated to mention that multiple job-xml elements are allowed as of schema 0.4
- 3.2.3 Updated to mention that multiple job-xml elements are allowed as of schema 0.4
2011AUG17
- 3.2.4 fs ‘chmod’ xml closing element typo in Example corrected
2011AUG12
- 3.2.4 fs ‘move’ action characteristics updated, to allow for consistent source and target paths and existing target path only if directory
- 18, Update the doc for user-retry of workflow action.
2011FEB19
- 10, Update the doc to rerun from the failed node.
2010OCT31
- 17, Added new section on Shared Libraries
2010APR27
- 3.2.3 Added new “arguments” tag to PIG actions
- 3.2.5 SSH actions are deprecated in Oozie schema 0.1 and removed in Oozie schema 0.2
- Appendix A, Added schema version 0.2
2009OCT20
- Appendix A, updated XML schema
2009SEP15
- 3.2.6 Removing support for sub-workflow in a different Oozie instance (removing the ‘oozie’ element)
2009SEP07
- 3.2.2.3 Added Map Reduce Pipes specifications.
- 3.2.2.4 Map-Reduce Examples. Previously was 3.2.2.3.
2009SEP02
- 10 Added missing skip nodes property name.
- 3.2.1.4 Reworded action recovery explanation.
2009AUG26
- 3.2.9 Added java action type
- 3.1.4 Example uses EL constant to refer to counter group/name
2009JUN09
- 12.2.4 Added build version resource to admin end-point
- 3.2.6 Added flag to propagate workflow configuration to sub-workflows
- 10 Added behavior for workflow job parameters given in the rerun
- 11.3.4 workflows info returns pagination information
2009MAY18
- 3.1.4 decision node, ‘default’ element, ‘name’ attribute changed to ‘to’
- 3.1.5 fork node, ‘transition’ element changed to ‘start’, ‘to’ attribute change to ‘path’
- 3.1.5 join node, ‘transition’ element remove, added ‘to’ attribute to ‘join’ element
- 3.2.1.4 Rewording on action recovery section
- 3.2.2 map-reduce action, added ‘job-tracker’, ‘name-node’ actions, ‘file’, ‘file’ and ‘archive’ elements
- 3.2.2.1 map-reduce action, remove from ‘streaming’ element ‘file’, ‘file’ and ‘archive’ elements
- 3.2.2.2 map-reduce action, reorganized streaming section
- 3.2.3 pig action, removed information about implementation (SSH), changed elements names
- 3.2.4 fs action, removed ‘fs-uri’ and ‘user-name’ elements, file system URI is now specified in path, user is propagated
- 3.2.6 sub-workflow action, renamed elements ‘oozie-url’ to ‘oozie’ and ‘workflow-app’ to ‘app-path’
- 4 Properties that are valid Java identifiers can be used as ${NAME}
- 4.1 Renamed default properties file from ‘configuration.xml’ to ‘default-configuration.xml’
- 4.2 Changes in EL Constants and Functions
- 5 Updated notification behavior and tokens
- 6 Changed user propagation behavior
- 7 Changed application packaging from ZIP to HDFS directory
- Removed application lifecycle and self containment model sections
- 10 Changed workflow job recovery, simplified recovery behavior
- 11 Detailed Web Services API
- 12 Updated Client API section
- 15 Updated Action Executor API section
- Appendix A XML namespace updated to ‘uri:oozie:workflow:0.1’
- Appendix A Updated XML schema to changes in map-reduce/pig/fs/ssh actions
- Appendix B Updated workflow example to schema changes
2009MAR25
- Changing all references of HWS to Oozie (project name)
- Typos, XML Formatting
- XML Schema URI correction
2009MAR09
- Changed CREATED job state to PREP to have same states as Hadoop
- Renamed ‘hadoop-workflow’ element to ‘workflow-app’
- Decision syntax changed to be ‘switch/case’ with no transition indirection
- Action nodes common root element ‘action’, with the action type as sub-element (using a single built-in XML schema)
- Action nodes have 2 explicit transitions ‘ok to’ and ‘error to’ enforced by XML schema
- Renamed ‘fail’ action element to ‘kill’
- Renamed ‘hadoop’ action element to ‘map-reduce’
- Renamed ‘hdfs’ action element to ‘fs’
- Updated all XML snippets and examples
- Made user propagation simpler and consistent
- Added Oozie XML schema to Appendix A
- Added workflow example to Appendix B
2009FEB22
- Opened JIRA HADOOP-5303
27/DEC/2012:
- Added information on dropping hcatalog table partitions in prepare block
- Added hcatalog EL functions section
0 Definitions
Action: An execution/computation task (Map-Reduce job, Pig job, a shell command). It can also be referred as task or ‘action node’.
Workflow: A collection of actions arranged in a control dependency DAG (Directed Acyclic Graph). “control dependency” from one action to another means that the second action can’t run until the first action has completed.
Workflow Definition: A programmatic description of a workflow that can be executed.
Workflow Definition Language: The language used to define a Workflow Definition.
Workflow Job: An executable instance of a workflow definition.
Workflow Engine: A system that executes workflows jobs. It can also be referred as a DAG engine.
1 Specification Highlights
A Workflow application is DAG that coordinates the following types of actions: Hadoop, Pig, and sub-workflows.
Flow control operations within the workflow applications can be done using decision, fork and join nodes. Cycles in workflows are not supported.
Actions and decisions can be parameterized with job properties, actions output (i.e. Hadoop counters) and file information (file exists, file size, etc). Formal parameters are expressed in the workflow definition as ${VAR} variables.
A Workflow application is a ZIP file that contains the workflow definition (an XML file), all the necessary files to run all the actions: JAR files for Map/Reduce jobs, shells for streaming Map/Reduce jobs, native libraries, Pig scripts, and other resource files.
Before running a workflow job, the corresponding workflow application must be deployed in Oozie.
Deploying workflow application and running workflow jobs can be done via command line tools, a WS API and a Java API.
Monitoring the system and workflow jobs can be done via a web console, command line tools, a WS API and a Java API.
When submitting a workflow job, a set of properties resolving all the formal parameters in the workflow definitions must be provided. This set of properties is a Hadoop configuration.
Possible states for a workflow jobs are: PREP, RUNNING, SUSPENDED, SUCCEEDED, KILLED and FAILED.
In the case of a action start failure in a workflow job, depending on the type of failure, Oozie will attempt automatic retries, it will request a manual retry or it will fail the workflow job.
Oozie can make HTTP callback notifications on action start/end/failure events and workflow end/failure events.
In the case of workflow job failure, the workflow job can be resubmitted skipping previously completed actions. Before doing a resubmission the workflow application could be updated with a patch to fix a problem in the workflow application code.
2 Workflow Definition
A workflow definition is a DAG with control flow nodes (start, end, decision, fork, join, kill) or action nodes (map-reduce, pig, etc.), nodes are connected by transitions arrows.
The workflow definition language is XML based and it is called hPDL (Hadoop Process Definition Language).
Refer to the Appendix A for theOozie Workflow Definition XML Schema. Appendix B has Workflow Definition Examples.
3 Workflow Nodes
Workflow nodes are classified in control flow nodes and action nodes:
- Control flow nodes: nodes that control the start and end of the workflow and workflow job execution path.
- Action nodes: nodes that trigger the execution of a computation/processing task.
Node names and transitions must be conform to the following pattern [a-zA-Z][\-_a-zA-Z0-0]*, of up to 20 characters long.
3.1 Control Flow Nodes
Control flow nodes define the beginning and the end of a workflow (the start, end and kill nodes) and provide a mechanism to control the workflow execution path (the decision, fork and join nodes).
3.1.1 Start Control Node
The start node is the entry point for a workflow job, it indicates the first workflow node the workflow job must transition to.
When a workflow is started, it automatically transitions to the node specified in the start.
A workflow definition must have one start node.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0"> ... <start to="[NODE-NAME]"/> ... </workflow-app>
The to attribute is the name of first workflow node to execute.
Example:
<workflow-app name="foo-wf" xmlns="uri:oozie:workflow:1.0">
...
<start to="firstHadoopJob"/>
...
</workflow-app>
3.1.2 End Control Node
The end node is the end for a workflow job, it indicates that the workflow job has completed successfully.
When a workflow job reaches the end it finishes successfully (SUCCEEDED).
If one or more actions started by the workflow job are executing when the end node is reached, the actions will be killed. In this scenario the workflow job is still considered as successfully run.
A workflow definition must have one end node.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<end name="[NODE-NAME]"/>
...
</workflow-app>
The name attribute is the name of the transition to do to end the workflow job.
Example:
<workflow-app name="foo-wf" xmlns="uri:oozie:workflow:1.0">
...
<end name="end"/>
</workflow-app>
3.1.3 Kill Control Node
The kill node allows a workflow job to kill itself.
When a workflow job reaches the kill it finishes in error (KILLED).
If one or more actions started by the workflow job are executing when the kill node is reached, the actions will be killed.
A workflow definition may have zero or more kill nodes.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<kill name="[NODE-NAME]">
<message>[MESSAGE-TO-LOG]</message>
</kill>
...
</workflow-app>
The name attribute in the kill node is the name of the Kill action node.
The content of the message element will be logged as the kill reason for the workflow job.
A kill node does not have transition elements because it ends the workflow job, as KILLED.
Example:
<workflow-app name="foo-wf" xmlns="uri:oozie:workflow:1.0">
...
<kill name="killBecauseNoInput">
<message>Input unavailable</message>
</kill>
...
</workflow-app>
3.1.4 Decision Control Node
A decision node enables a workflow to make a selection on the execution path to follow.
The behavior of a decision node can be seen as a switch-case statement.
A decision node consists of a list of predicates-transition pairs plus a default transition. Predicates are evaluated in order or appearance until one of them evaluates to true and the corresponding transition is taken. If none of the predicates evaluates to true the default transition is taken.
Predicates are JSP Expression Language (EL) expressions (refer to section 4.2 of this document) that resolve into a boolean value, true or false. For example:
${fs:fileSize('/usr/foo/myinputdir') gt 10 * GB}
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<decision name="[NODE-NAME]">
<switch>
<case to="[NODE_NAME]">[PREDICATE]</case>
...
<case to="[NODE_NAME]">[PREDICATE]</case>
<default to="[NODE_NAME]"/>
</switch>
</decision>
...
</workflow-app>
The name attribute in the decision node is the name of the decision node.
Each case elements contains a predicate and a transition name. The predicate ELs are evaluated in order until one returns true and the corresponding transition is taken.
The default element indicates the transition to take if none of the predicates evaluates to true.
All decision nodes must have a default element to avoid bringing the workflow into an error state if none of the predicates evaluates to true.
Example:
<workflow-app name="foo-wf" xmlns="uri:oozie:workflow:1.0">
...
<decision name="mydecision">
<switch>
<case to="reconsolidatejob">
${fs:fileSize(secondjobOutputDir) gt 10 * GB}
</case> <case to="rexpandjob">
${fs:fileSize(secondjobOutputDir) lt 100 * MB}
</case>
<case to="recomputejob">
${ hadoop:counters('secondjob')[RECORDS][REDUCE_OUT] lt 1000000 }
</case>
<default to="end"/>
</switch>
</decision>
...
</workflow-app>
3.1.5 Fork and Join Control Nodes
A fork node splits one path of execution into multiple concurrent paths of execution.
A join node waits until every concurrent execution path of a previous fork node arrives to it.
The fork and join nodes must be used in pairs. The join node assumes concurrent execution paths are children of the same fork node.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<fork name="[FORK-NODE-NAME]">
<path start="[NODE-NAME]" />
...
<path start="[NODE-NAME]" />
</fork>
...
<join name="[JOIN-NODE-NAME]" to="[NODE-NAME]" />
...
</workflow-app>
The name attribute in the fork node is the name of the workflow fork node. The start attribute in the path elements in the fork node indicate the name of the workflow node that will be part of the concurrent execution paths.
The name attribute in the join node is the name of the workflow join node. The to attribute in the join node indicates the name of the workflow node that will executed after all concurrent execution paths of the corresponding fork arrive to the join node.
Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<fork name="forking">
<path start="firstparalleljob"/>
<path start="secondparalleljob"/>
</fork>
<action name="firstparallejob">
<map-reduce>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<job-xml>job1.xml</job-xml>
</map-reduce>
<ok to="joining"/>
<error to="kill"/>
</action>
<action name="secondparalleljob">
<map-reduce>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<job-xml>job2.xml</job-xml>
</map-reduce>
<ok to="joining"/>
<error to="kill"/>
</action>
<join name="joining" to="nextaction"/>
...
</workflow-app>
By default, Oozie performs some validation that any forking in a workflow is valid and won’t lead to any incorrect behavior or instability. However, if Oozie is preventing a workflow from being submitted and you are very certain that it should work, you can disable forkjoin validation so that Oozie will accept the workflow. To disable this validation just for a specific workflow, simply set oozie.wf.validate.ForkJoin to false in the job.properties file. To disable this validation for all workflows, simply set oozie.validate.ForkJoin to false in the oozie-site.xml file. Disabling this validation is determined by the AND of both of these properties, so it will be disabled if either or both are set to false and only enabled if both are set to true (or not specified).
3.2 Workflow Action Nodes
Action nodes are the mechanism by which a workflow triggers the execution of a computation/processing task.
3.2.1 Action Basis
The following sub-sections define common behavior and capabilities for all action types.
3.2.1.1 Action Computation/Processing Is Always Remote
All computation/processing tasks triggered by an action node are remote to Oozie. No workflow application specific computation/processing task is executed within Oozie.
3.2.1.2 Actions Are Asynchronous
All computation/processing tasks triggered by an action node are executed asynchronously by Oozie. For most types of computation/processing tasks triggered by workflow action, the workflow job has to wait until the computation/processing task completes before transitioning to the following node in the workflow.
The exception is the fs action that is handled as a synchronous action.
Oozie can detect completion of computation/processing tasks by two different means, callbacks and polling.
When a computation/processing tasks is started by Oozie, Oozie provides a unique callback URL to the task, the task should invoke the given URL to notify its completion.
For cases that the task failed to invoke the callback URL for any reason (i.e. a transient network failure) or when the type of task cannot invoke the callback URL upon completion, Oozie has a mechanism to poll computation/processing tasks for completion.
3.2.1.3 Actions Have 2 Transitions, ok and error
If a computation/processing task -triggered by a workflow- completes successfully, it transitions to ok.
If a computation/processing task -triggered by a workflow- fails to complete successfully, its transitions to error.
If a computation/processing task exits in error, there computation/processing task must provide error-code and error-message information to Oozie. This information can be used from decision nodes to implement a fine grain error handling at workflow application level.
Each action type must clearly define all the error codes it can produce.
3.2.1.4 Action Recovery
Oozie provides recovery capabilities when starting or ending actions.
Once an action starts successfully Oozie will not retry starting the action if the action fails during its execution. The assumption is that the external system (i.e. Hadoop) executing the action has enough resilience to recover jobs once it has started (i.e. Hadoop task retries).
Java actions are a special case with regard to retries. Although Oozie itself does not retry Java actions should they fail after they have successfully started, Hadoop itself can cause the action to be restarted due to a map task retry on the map task running the Java application. See the Java Action section below for more detail.
For failures that occur prior to the start of the job, Oozie will have different recovery strategies depending on the nature of the failure.
If the failure is of transient nature, Oozie will perform retries after a pre-defined time interval. The number of retries and timer interval for a type of action must be pre-configured at Oozie level. Workflow jobs can override such configuration.
Examples of a transient failures are network problems or a remote system temporary unavailable.
If the failure is of non-transient nature, Oozie will suspend the workflow job until an manual or programmatic intervention resumes the workflow job and the action start or end is retried. It is the responsibility of an administrator or an external managing system to perform any necessary cleanup before resuming the workflow job.
If the failure is an error and a retry will not resolve the problem, Oozie will perform the error transition for the action.
3.2.2 Map-Reduce Action
The map-reduce action starts a Hadoop map/reduce job from a workflow. Hadoop jobs can be Java Map/Reduce jobs or streaming jobs.
A map-reduce action can be configured to perform file system cleanup and directory creation before starting the map reduce job. This capability enables Oozie to retry a Hadoop job in the situation of a transient failure (Hadoop checks the non-existence of the job output directory and then creates it when the Hadoop job is starting, thus a retry without cleanup of the job output directory would fail).
The workflow job will wait until the Hadoop map/reduce job completes before continuing to the next action in the workflow execution path.
The counters of the Hadoop job and job exit status (FAILED, KILLED or SUCCEEDED) must be available to the workflow job after the Hadoop jobs ends. This information can be used from within decision nodes and other actions configurations.
The map-reduce action has to be configured with all the necessary Hadoop JobConf properties to run the Hadoop map/reduce job.
Hadoop JobConf properties can be specified as part of
- the config-default.xml or
- JobConf XML file bundled with the workflow application or
- <global> tag in workflow definition or
- Inline map-reduce action configuration or
- An implementation of OozieActionConfigurator specified by the <config-class> tag in workflow definition.
The configuration properties are loaded in the following above order i.e. streaming, job-xml, configuration, and config-class, and the precedence order is later values override earlier values.
Streaming and inline property values can be parameterized (templatized) using EL expressions.
The Hadoop mapred.job.tracker and fs.default.name properties must not be present in the job-xml and inline configuration.
3.2.2.1 Adding Files and Archives for the Job
The file, archive elements make available, to map-reduce jobs, files and archives. If the specified path is relative, it is assumed the file or archiver are within the application directory, in the corresponding sub-path. If the path is absolute, the file or archive it is expected in the given absolute path.
Files specified with the file element, will be symbolic links in the home directory of the task.
If a file is a native library (an ‘.so’ or a ‘.so.#’ file), it will be symlinked as and ‘.so’ file in the task running directory, thus available to the task JVM.
To force a symlink for a file on the task running directory, use a ‘#’ followed by the symlink name. For example ‘mycat.sh#cat’.
Refer to Hadoop distributed cache documentation for details more details on files and archives.
3.2.2.2 Configuring the MapReduce action with Java code
Java code can be used to further configure the MapReduce action. This can be useful if you already have “driver” code for your MapReduce action, if you’re more familiar with MapReduce’s Java API, if there’s some configuration that requires logic, or some configuration that’s difficult to do in straight XML (e.g. Avro).
Create a class that implements the org.apache.oozie.action.hadoop.OozieActionConfigurator interface from the “oozie-sharelib-oozie” artifact. It contains a single method that receives a JobConf as an argument. Any configuration properties set on this JobConf will be used by the MapReduce action.
The OozieActionConfigurator has this signature:
public interface OozieActionConfigurator {
public void configure(JobConf actionConf) throws OozieActionConfiguratorException;
}
where actionConf is the JobConf you can update. If you need to throw an Exception, you can wrap it in an OozieActionConfiguratorException, also in the “oozie-sharelib-oozie” artifact.
For example:
package com.example;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.oozie.action.hadoop.OozieActionConfigurator;
import org.apache.oozie.action.hadoop.OozieActionConfiguratorException;
import org.apache.oozie.example.SampleMapper;
import org.apache.oozie.example.SampleReducer;
public class MyConfigClass implements OozieActionConfigurator {
@Override
public void configure(JobConf actionConf) throws OozieActionConfiguratorException {
if (actionConf.getUser() == null) {
throw new OozieActionConfiguratorException("No user set");
}
actionConf.setMapperClass(SampleMapper.class);
actionConf.setReducerClass(SampleReducer.class);
FileInputFormat.setInputPaths(actionConf, new Path("/user/" + actionConf.getUser() + "/input-data"));
FileOutputFormat.setOutputPath(actionConf, new Path("/user/" + actionConf.getUser() + "/output"));
...
}
}
To use your config class in your MapReduce action, simply compile it into a jar, make the jar available to your action, and specify the class name in the config-class element (this requires at least schema 0.5):
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<map-reduce>
...
<job-xml>[JOB-XML-FILE]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<config-class>com.example.MyConfigClass</config-class>
...
</map-reduce>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
Another example of this can be found in the “map-reduce” example that comes with Oozie.
A useful tip: The initial JobConf passed to the configure method includes all of the properties listed in the configuration section of the MR action in a workflow. If you need to pass any information to your OozieActionConfigurator, you can simply put them here.
3.2.2.3 Streaming
Streaming information can be specified in the streaming element.
The mapper and reducer elements are used to specify the executable/script to be used as mapper and reducer.
User defined scripts must be bundled with the workflow application and they must be declared in the files element of the streaming configuration. If the are not declared in the files element of the configuration it is assumed they will be available (and in the command PATH) of the Hadoop slave machines.
Some streaming jobs require Files found on HDFS to be available to the mapper/reducer scripts. This is done using the file and archive elements described in the previous section.
The Mapper/Reducer can be overridden by a mapred.mapper.class or mapred.reducer.class properties in the job-xml file or configuration elements.
3.2.2.4 Pipes
Pipes information can be specified in the pipes element.
A subset of the command line options which can be used while using the Hadoop Pipes Submitter can be specified via elements - map, reduce, inputformat, partitioner, writer, program.
The program element is used to specify the executable/script to be used.
User defined program must be bundled with the workflow application.
Some pipe jobs require Files found on HDFS to be available to the mapper/reducer scripts. This is done using the file and archive elements described in the previous section.
Pipe properties can be overridden by specifying them in the job-xml file or configuration element.
3.2.2.5 Syntax
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<map-reduce>
<resource-manager>[RESOURCE-MANAGER]</resource-manager>
<name-node>[NAME-NODE]</name-node>
<prepare>
<delete path="[PATH]"/>
...
<mkdir path="[PATH]"/>
...
</prepare>
<streaming>
<mapper>[MAPPER-PROCESS]</mapper>
<reducer>[REDUCER-PROCESS]</reducer>
<record-reader>[RECORD-READER-CLASS]</record-reader>
<record-reader-mapping>[NAME=VALUE]</record-reader-mapping>
...
<env>[NAME=VALUE]</env>
...
</streaming>
<!-- Either streaming or pipes can be specified for an action, not both -->
<pipes>
<map>[MAPPER]</map>
<reduce>[REDUCER]</reducer>
<inputformat>[INPUTFORMAT]</inputformat>
<partitioner>[PARTITIONER]</partitioner>
<writer>[OUTPUTFORMAT]</writer>
<program>[EXECUTABLE]</program>
</pipes>
<job-xml>[JOB-XML-FILE]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<config-class>com.example.MyConfigClass</config-class>
<file>[FILE-PATH]</file>
...
<archive>[FILE-PATH]</archive>
...
</map-reduce>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
The prepare element, if present, indicates a list of paths to delete before starting the job. This should be used exclusively for directory cleanup or dropping of hcatalog table or table partitions for the job to be executed. The delete operation will be performed in the fs.default.name filesystem for hdfs URIs. The format for specifying hcatalog table URI is hcat://[metastore server]:[port]/[database name]/[table name] and format to specify a hcatalog table partition URI is hcat://[metastore server]:[port]/[database name]/[table name]/[partkey1]=[value];[partkey2]=[value]. In case of a hcatalog URI, the hive-site.xml needs to be shipped using file tag and the hcatalog and hive jars need to be placed in workflow lib directory or specified using archive tag.
The job-xml element, if present, must refer to a Hadoop JobConf job.xml file bundled in the workflow application. By default the job.xml file is taken from the workflow application namenode, regardless the namenode specified for the action. To specify a job.xml on another namenode use a fully qualified file path. The job-xml element is optional and as of schema 0.4, multiple job-xml elements are allowed in order to specify multiple Hadoop JobConf job.xml files.
The configuration element, if present, contains JobConf properties for the Hadoop job.
Properties specified in the configuration element override properties specified in the file specified in the job-xml element.
As of schema 0.5, the config-class element, if present, contains a class that implements OozieActionConfigurator that can be used to further configure the MapReduce job.
Properties specified in the config-class class override properties specified in configuration element.
External Stats can be turned on/off by specifying the property oozie.action.external.stats.write as true or false in the configuration element of workflow.xml. The default value for this property is false.
The file element, if present, must specify the target symbolic link for binaries by separating the original file and target with a # (file#target-sym-link). This is not required for libraries.
The mapper and reducer process for streaming jobs, should specify the executable command with URL encoding. e.g. ‘%’ should be replaced by ‘%25’.
Example:
<workflow-app name="foo-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="myfirstHadoopJob">
<map-reduce>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<prepare>
<delete path="hdfs://foo:8020/usr/tucu/output-data"/>
</prepare>
<job-xml>/myfirstjob.xml</job-xml>
<configuration>
<property>
<name>mapred.input.dir</name>
<value>/usr/tucu/input-data</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/usr/tucu/input-data</value>
</property>
<property>
<name>mapred.reduce.tasks</name>
<value>${firstJobReducers}</value>
</property>
<property>
<name>oozie.action.external.stats.write</name>
<value>true</value>
</property>
</configuration>
</map-reduce>
<ok to="myNextAction"/>
<error to="errorCleanup"/>
</action>
...
</workflow-app>
In the above example, the number of Reducers to be used by the Map/Reduce job has to be specified as a parameter of the workflow job configuration when creating the workflow job.
Streaming Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="firstjob">
<map-reduce>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<prepare>
<delete path="${output}"/>
</prepare>
<streaming>
<mapper>/bin/bash testarchive/bin/mapper.sh testfile</mapper>
<reducer>/bin/bash testarchive/bin/reducer.sh</reducer>
</streaming>
<configuration>
<property>
<name>mapred.input.dir</name>
<value>${input}</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>${output}</value>
</property>
<property>
<name>stream.num.map.output.key.fields</name>
<value>3</value>
</property>
</configuration>
<file>/users/blabla/testfile.sh#testfile</file>
<archive>/users/blabla/testarchive.jar#testarchive</archive>
</map-reduce>
<ok to="end"/>
<error to="kill"/>
</action>
...
</workflow-app>
Pipes Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="firstjob">
<map-reduce>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<prepare>
<delete path="${output}"/>
</prepare>
<pipes>
<program>bin/wordcount-simple#wordcount-simple</program>
</pipes>
<configuration>
<property>
<name>mapred.input.dir</name>
<value>${input}</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>${output}</value>
</property>
</configuration>
<archive>/users/blabla/testarchive.jar#testarchive</archive>
</map-reduce>
<ok to="end"/>
<error to="kill"/>
</action>
...
</workflow-app>
3.2.3 Pig Action
The pig action starts a Pig job.
The workflow job will wait until the pig job completes before continuing to the next action.
The pig action has to be configured with the resource-manager, name-node, pig script and the necessary parameters and configuration to run the Pig job.
A pig action can be configured to perform HDFS files/directories cleanup or HCatalog partitions cleanup before starting the Pig job. This capability enables Oozie to retry a Pig job in the situation of a transient failure (Pig creates temporary directories for intermediate data, thus a retry without cleanup would fail).
Hadoop JobConf properties can be specified as part of
- the config-default.xml or
- JobConf XML file bundled with the workflow application or
- <global> tag in workflow definition or
- Inline pig action configuration.
The configuration properties are loaded in the following above order i.e. job-xml and configuration, and the precedence order is later values override earlier values.
Inline property values can be parameterized (templatized) using EL expressions.
The YARN yarn.resourcemanager.address and HDFS fs.default.name properties must not be present in the job-xml and inline configuration.
As with Hadoop map-reduce jobs, it is possible to add files and archives to be available to the Pig job, refer to section [#FilesArchives][Adding Files and Archives for the Job].
Syntax for Pig actions in Oozie schema 1.0:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<pig>
<resource-manager>[RESOURCE-MANAGER]</resource-manager>
<name-node>[NAME-NODE]</name-node>
<prepare>
<delete path="[PATH]"/>
...
<mkdir path="[PATH]"/>
...
</prepare>
<job-xml>[JOB-XML-FILE]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<script>[PIG-SCRIPT]</script>
<param>[PARAM-VALUE]</param>
...
<param>[PARAM-VALUE]</param>
<argument>[ARGUMENT-VALUE]</argument>
...
<argument>[ARGUMENT-VALUE]</argument>
<file>[FILE-PATH]</file>
...
<archive>[FILE-PATH]</archive>
...
</pig>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
Syntax for Pig actions in Oozie schema 0.2:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:0.2">
...
<action name="[NODE-NAME]">
<pig>
<job-tracker>[JOB-TRACKER]</job-tracker>
<name-node>[NAME-NODE]</name-node>
<prepare>
<delete path="[PATH]"/>
...
<mkdir path="[PATH]"/>
...
</prepare>
<job-xml>[JOB-XML-FILE]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<script>[PIG-SCRIPT]</script>
<param>[PARAM-VALUE]</param>
...
<param>[PARAM-VALUE]</param>
<argument>[ARGUMENT-VALUE]</argument>
...
<argument>[ARGUMENT-VALUE]</argument>
<file>[FILE-PATH]</file>
...
<archive>[FILE-PATH]</archive>
...
</pig>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
Syntax for Pig actions in Oozie schema 0.1:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:0.1">
...
<action name="[NODE-NAME]">
<pig>
<job-tracker>[JOB-TRACKER]</job-tracker>
<name-node>[NAME-NODE]</name-node>
<prepare>
<delete path="[PATH]"/>
...
<mkdir path="[PATH]"/>
...
</prepare>
<job-xml>[JOB-XML-FILE]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<script>[PIG-SCRIPT]</script>
<param>[PARAM-VALUE]</param>
...
<param>[PARAM-VALUE]</param>
<file>[FILE-PATH]</file>
...
<archive>[FILE-PATH]</archive>
...
</pig>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
The prepare element, if present, indicates a list of paths to delete before starting the job. This should be used exclusively for directory cleanup or dropping of hcatalog table or table partitions for the job to be executed. The delete operation will be performed in the fs.default.name filesystem for hdfs URIs. The format for specifying hcatalog table URI is hcat://[metastore server]:[port]/[database name]/[table name] and format to specify a hcatalog table partition URI is hcat://[metastore server]:[port]/[database name]/[table name]/[partkey1]=[value];[partkey2]=[value]. In case of a hcatalog URI, the hive-site.xml needs to be shipped using file tag and the hcatalog and hive jars need to be placed in workflow lib directory or specified using archive tag.
The job-xml element, if present, must refer to a Hadoop JobConf job.xml file bundled in the workflow application. The job-xml element is optional and as of schema 0.4, multiple job-xml elements are allowed in order to specify multiple Hadoop JobConf job.xml files.
The configuration element, if present, contains JobConf properties for the underlying Hadoop jobs.
Properties specified in the configuration element override properties specified in the file specified in the job-xml element.
External Stats can be turned on/off by specifying the property oozie.action.external.stats.write as true or false in the configuration element of workflow.xml. The default value for this property is false.
The inline and job-xml configuration properties are passed to the Hadoop jobs submitted by Pig runtime.
The script element contains the pig script to execute. The pig script can be templatized with variables of the form ${VARIABLE}. The values of these variables can then be specified using the params element.
NOTE: Oozie will perform the parameter substitution before firing the pig job. This is different from the parameter substitution mechanism provided by Pig, which has a few limitations.
The params element, if present, contains parameters to be passed to the pig script.
In Oozie schema 0.2: The arguments element, if present, contains arguments to be passed to the pig script.
All the above elements can be parameterized (templatized) using EL expressions.
Example for Oozie schema 0.2:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:0.2">
...
<action name="myfirstpigjob">
<pig>
<job-tracker>foo:8021</job-tracker>
<name-node>bar:8020</name-node>
<prepare>
<delete path="${jobOutput}"/>
</prepare>
<configuration>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
<property>
<name>oozie.action.external.stats.write</name>
<value>true</value>
</property>
</configuration>
<script>/mypigscript.pig</script>
<argument>-param</argument>
<argument>INPUT=${inputDir}</argument>
<argument>-param</argument>
<argument>OUTPUT=${outputDir}/pig-output3</argument>
</pig>
<ok to="myotherjob"/>
<error to="errorcleanup"/>
</action>
...
</workflow-app>
Example for Oozie schema 0.1:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:0.1">
...
<action name="myfirstpigjob">
<pig>
<job-tracker>foo:8021</job-tracker>
<name-node>bar:8020</name-node>
<prepare>
<delete path="${jobOutput}"/>
</prepare>
<configuration>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
</configuration>
<script>/mypigscript.pig</script>
<param>InputDir=/home/tucu/input-data</param>
<param>OutputDir=${jobOutput}</param>
</pig>
<ok to="myotherjob"/>
<error to="errorcleanup"/>
</action>
...
</workflow-app>
3.2.4 Fs (HDFS) action
The fs action allows to manipulate files and directories in HDFS from a workflow application. The supported commands are move, delete, mkdir, chmod, touchz, setrep and chgrp.
The FS commands are executed synchronously from within the FS action, the workflow job will wait until the specified file commands are completed before continuing to the next action.
Path names specified in the fs action can be parameterized (templatized) using EL expressions. Path name should be specified as a absolute path. In case of move, delete, chmod and chgrp commands, a glob pattern can also be specified instead of an absolute path. For move, glob pattern can only be specified for source path and not the target.
Each file path must specify the file system URI, for move operations, the target must not specify the system URI.
IMPORTANT: For the purposes of copying files within a cluster it is recommended to refer to the distcp action instead. Refer to distcp action to copy files within a cluster.
IMPORTANT: All the commands within fs action do not happen atomically, if a fs action fails half way in the commands being executed, successfully executed commands are not rolled back. The fs action, before executing any command must check that source paths exist and target paths don’t exist (constraint regarding target relaxed for the move action. See below for details), thus failing before executing any command. Therefore the validity of all paths specified in one fs action are evaluated before any of the file operation are executed. Thus there is less chance of an error occurring while the fs action executes.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<fs>
<delete path='[PATH]' skip-trash='[true/false]'/>
...
<mkdir path='[PATH]'/>
...
<move source='[SOURCE-PATH]' target='[TARGET-PATH]'/>
...
<chmod path='[PATH]' permissions='[PERMISSIONS]' dir-files='false' />
...
<touchz path='[PATH]' />
...
<chgrp path='[PATH]' group='[GROUP]' dir-files='false' />
...
<setrep path='[PATH]' replication-factor='2'/>
</fs>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
The delete command deletes the specified path, if it is a directory it deletes recursively all its content and then deletes the directory. By default it does skip trash. It can be moved to trash by setting the value of skip-trash to ‘false’. It can also be used to drop hcat tables/partitions. This is the only FS command which supports HCatalog URIs as well. For eg:
<delete path='hcat://[metastore server]:[port]/[database name]/[table name]'/> OR <delete path='hcat://[metastore server]:[port]/[database name]/[table name]/[partkey1]=[value];[partkey2]=[value];...'/>
The mkdir command creates the specified directory, it creates all missing directories in the path. If the directory already exist it does a no-op.
In the move command the source path must exist. The following scenarios are addressed for a move:
- The file system URI(e.g. hdfs://{nameNode}) can be skipped in the target path. It is understood to be the same as that of the source. But if the target path does contain the system URI, it cannot be different than that of the source.
- The parent directory of the target path must exist
- For the target path, if it is a file, then it must not already exist.
- However, if the target path is an already existing directory, the move action will place your source as a child of the target directory.
The chmod command changes the permissions for the specified path. Permissions can be specified using the Unix Symbolic representation (e.g. -rwxrw-rw-) or an octal representation (755). When doing a chmod command on a directory, by default the command is applied to the directory and the files one level within the directory. To apply the chmod command to the directory, without affecting the files within it, the dir-files attribute must be set to false. To apply the chmod command recursively to all levels within a directory, put a recursive element inside the <chmod> element.
The touchz command creates a zero length file in the specified path if none exists. If one already exists, then touchz will perform a touch operation. Touchz works only for absolute paths.
The chgrp command changes the group for the specified path. When doing a chgrp command on a directory, by default the command is applied to the directory and the files one level within the directory. To apply the chgrp command to the directory, without affecting the files within it, the dir-files attribute must be set to false. To apply the chgrp command recursively to all levels within a directory, put a recursive element inside the <chgrp> element.
The setrep command changes replication factor of an hdfs file(s). Changing RF of directories or symlinks is not supported; this action requires an argument for RF.
Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="hdfscommands">
<fs>
<delete path='hdfs://foo:8020/usr/tucu/temp-data'/>
<mkdir path='archives/${wf:id()}'/>
<move source='${jobInput}' target='archives/${wf:id()}/processed-input'/>
<chmod path='${jobOutput}' permissions='-rwxrw-rw-' dir-files='true'><recursive/></chmod>
<chgrp path='${jobOutput}' group='testgroup' dir-files='true'><recursive/></chgrp>
<setrep path='archives/${wf:id()/filename(s)}' replication-factor='2'/>
</fs>
<ok to="myotherjob"/>
<error to="errorcleanup"/>
</action>
...
</workflow-app>
In the above example, a directory named after the workflow job ID is created and the input of the job, passed as workflow configuration parameter, is archived under the previously created directory.
As of schema 0.4, if a name-node element is specified, then it is not necessary for any of the paths to start with the file system URI as it is taken from the name-node element. This is also true if the name-node is specified in the global section (see Global Configurations)
As of schema 0.4, zero or more job-xml elements can be specified; these must refer to Hadoop JobConf job.xml formatted files bundled in the workflow application. They can be used to set additional properties for the FileSystem instance.
As of schema 0.4, if a configuration element is specified, then it will also be used to set additional JobConf properties for the FileSystem instance. Properties specified in the configuration element override properties specified in the files specified by any job-xml elements.
Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:0.4">
...
<action name="hdfscommands">
<fs>
<name-node>hdfs://foo:8020</name-node>
<job-xml>fs-info.xml</job-xml>
<configuration>
<property>
<name>some.property</name>
<value>some.value</value>
</property>
</configuration>
<delete path='/usr/tucu/temp-data'/>
</fs>
<ok to="myotherjob"/>
<error to="errorcleanup"/>
</action>
...
</workflow-app>
3.2.5 Sub-workflow Action
The sub-workflow action runs a child workflow job, the child workflow job can be in the same Oozie system or in another Oozie system.
The parent workflow job will wait until the child workflow job has completed.
There can be several sub-workflows defined within a single workflow, each under its own action element.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<sub-workflow>
<app-path>[WF-APPLICATION-PATH]</app-path>
<propagate-configuration/>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
</sub-workflow>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
The child workflow job runs in the same Oozie system instance where the parent workflow job is running.
The app-path element specifies the path to the workflow application of the child workflow job.
The propagate-configuration flag, if present, indicates that the workflow job configuration should be propagated to the child workflow.
The configuration section can be used to specify the job properties that are required to run the child workflow job.
The configuration of the sub-workflow action can be parameterized (templatized) using EL expressions.
Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="a">
<sub-workflow>
<app-path>child-wf</app-path>
<configuration>
<property>
<name>input.dir</name>
<value>${wf:id()}/second-mr-output</value>
</property>
</configuration>
</sub-workflow>
<ok to="end"/>
<error to="kill"/>
</action>
...
</workflow-app>
In the above example, the workflow definition with the name child-wf will be run on the Oozie instance at .http://myhost:11000/oozie. The specified workflow application must be already deployed on the target Oozie instance.
A configuration parameter input.dir is being passed as job property to the child workflow job.
The subworkflow can inherit the lib jars from the parent workflow by setting oozie.subworkflow.classpath.inheritance to true in oozie-site.xml or on a per-job basis by setting oozie.wf.subworkflow.classpath.inheritance to true in a job.properties file. If both are specified, oozie.wf.subworkflow.classpath.inheritance has priority. If the subworkflow and the parent have conflicting jars, the subworkflow’s jar has priority. By default, oozie.wf.subworkflow.classpath.inheritance is set to false.
To prevent errant workflows from starting infinitely recursive subworkflows, oozie.action.subworkflow.max.depth can be specified in oozie-site.xml to set the maximum depth of subworkflow calls. For example, if set to 3, then a workflow can start subwf1, which can start subwf2, which can start subwf3; but if subwf3 tries to start subwf4, then the action will fail. The default is 50.
3.2.6 Java Action
The java action will execute the public static void main(String[] args) method of the specified main Java class.
Java applications are executed in the Hadoop cluster as map-reduce job with a single Mapper task.
The workflow job will wait until the java application completes its execution before continuing to the next action.
The java action has to be configured with the resource-manager, name-node, main Java class, JVM options and arguments.
To indicate an ok action transition, the main Java class must complete gracefully the main method invocation.
To indicate an error action transition, the main Java class must throw an exception.
The main Java class can call System.exit(int n). Exit code zero is regarded as OK, while non-zero exit codes will cause the java action to do an error transition and exit.
A java action can be configured to perform HDFS files/directories cleanup or HCatalog partitions cleanup before starting the Java application. This capability enables Oozie to retry a Java application in the situation of a transient or non-transient failure (This can be used to cleanup any temporary data which may have been created by the Java application in case of failure).
A java action can create a Hadoop configuration for interacting with a cluster (e.g. launching a map-reduce job). Oozie prepares a Hadoop configuration file which includes the environments site configuration files (e.g. hdfs-site.xml, mapred-site.xml, etc) plus the properties added to the <configuration> section of the java action. The Hadoop configuration file is made available as a local file to the Java application in its running directory. It can be added to the java actions Hadoop configuration by referencing the system property: oozie.action.conf.xml. For example:
// loading action conf prepared by Oozie
Configuration actionConf = new Configuration(false);
actionConf.addResource(new Path("file:///", System.getProperty("oozie.action.conf.xml")));
If oozie.action.conf.xml is not added then the job will pick up the mapred-default properties and this may result in unexpected behaviour. For repeated configuration properties later values override earlier ones.
Inline property values can be parameterized (templatized) using EL expressions.
The YARN yarn.resourcemanager.address (resource-manager) and HDFS fs.default.name (name-node) properties must not be present in the job-xml and in the inline configuration.
As with map-reduce and pig actions, it is possible to add files and archives to be available to the Java application. Refer to section [#FilesArchives][Adding Files and Archives for the Job].
The capture-output element can be used to propagate values back into Oozie context, which can then be accessed via EL-functions. This needs to be written out as a java properties format file. The filename is obtained via a System property specified by the constant oozie.action.output.properties
IMPORTANT: In order for a Java action to succeed on a secure cluster, it must propagate the Hadoop delegation token like in the following code snippet (this is benign on non-secure clusters):
// propagate delegation related props from launcher job to MR job
if (System.getenv("HADOOP_TOKEN_FILE_LOCATION") != null) {
jobConf.set("mapreduce.job.credentials.binary", System.getenv("HADOOP_TOKEN_FILE_LOCATION"));
}
IMPORTANT: Because the Java application is run from within a Map-Reduce job, from Hadoop 0.20. onwards a queue must be assigned to it. The queue name must be specified as a configuration property.
IMPORTANT: The Java application from a Java action is executed in a single map task. If the task is abnormally terminated, such as due to a TaskTracker restart (e.g. during cluster maintenance), the task will be retried via the normal Hadoop task retry mechanism. To avoid workflow failure, the application should be written in a fashion that is resilient to such retries, for example by detecting and deleting incomplete outputs or picking back up from complete outputs. Furthermore, if a Java action spawns asynchronous activity outside the JVM of the action itself (such as by launching additional MapReduce jobs), the application must consider the possibility of collisions with activity spawned by the new instance.
Syntax:
<workflow-app name="[WF-DEF-NAME]" xmlns="uri:oozie:workflow:1.0">
...
<action name="[NODE-NAME]">
<java>
<resource-manager>[RESOURCE-MANAGER]</resource-manager>
<name-node>[NAME-NODE]</name-node>
<prepare>
<delete path="[PATH]"/>
...
<mkdir path="[PATH]"/>
...
</prepare>
<job-xml>[JOB-XML]</job-xml>
<configuration>
<property>
<name>[PROPERTY-NAME]</name>
<value>[PROPERTY-VALUE]</value>
</property>
...
</configuration>
<main-class>[MAIN-CLASS]</main-class>
<java-opts>[JAVA-STARTUP-OPTS]</java-opts>
<arg>ARGUMENT</arg>
...
<file>[FILE-PATH]</file>
...
<archive>[FILE-PATH]</archive>
...
<capture-output />
</java>
<ok to="[NODE-NAME]"/>
<error to="[NODE-NAME]"/>
</action>
...
</workflow-app>
The prepare element, if present, indicates a list of paths to delete before starting the Java application. This should be used exclusively for directory cleanup or dropping of hcatalog table or table partitions for the Java application to be executed. In case of delete, a glob pattern can be used to specify path. The format for specifying hcatalog table URI is hcat://[metastore server]:[port]/[database name]/[table name] and format to specify a hcatalog table partition URI is hcat://[metastore server]:[port]/[database name]/[table name]/[partkey1]=[value];[partkey2]=[value]. In case of a hcatalog URI, the hive-site.xml needs to be shipped using file tag and the hcatalog and hive jars need to be placed in workflow lib directory or specified using archive tag.
The java-opts and java-opt elements, if present, contains the command line parameters which are to be used to start the JVM that will execute the Java application. Using this element is equivalent to using the mapred.child.java.opts or mapreduce.map.java.opts configuration properties, with the advantage that Oozie will append to these properties instead of simply setting them (e.g. if you have one of these properties specified in mapred-site.xml, setting it again in the configuration element will override it, but using java-opts or java-opt will instead append to it, preserving the original value). You can have either one java-opts, multiple java-opt, or neither; you cannot use both at the same time. In any case, Oozie will set both mapred.child.java.opts and mapreduce.map.java.opts to the same value based on combining them. In other words, after Oozie is finished:
mapred.child.java.opts <-- "<mapred.child.java.opts> <mapreduce.map.java.opts> <java-opt...|java-opts>" mapreduce.map.java.opts <-- "<mapred.child.java.opts> <mapreduce.map.java.opts> <java-opt...|java-opts>"
In the case that parameters are repeated, the latest instance of the parameter is used by Java. This means that java-opt (or java-opts) has the highest priority, followed by mapreduce.map.java.opts, and finally mapred.child.java.opts. When multiple java-opt are specified, they are included from top to bottom ordering, where the bottom has highest priority.
The arg elements, if present, contains arguments for the main function. The value of each arg element is considered a single argument and they are passed to the main method in the same order.
All the above elements can be parameterized (templatized) using EL expressions.
Example:
<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:1.0">
...
<action name="myfirstjavajob">
<java>
<resource-manager>foo:8032</resource-manager>
<name-node>bar:8020</name-node>
<prepare>
<delete path="${jobOutput}"/>
</prepare>
<configuration>
<property>
<name>mapred.queue.name</name>
<value>default</value>
</property>
</configuration>
<main-class>org.apache.oozie.MyFirstMainClass</main-class>
<java-opts>-Dblah</java-opts>
<arg>argument1</arg>
<arg>argument2</arg>
</java>
<ok to="myotherjob"/>
<error to="errorcleanup"/>
</action>
...
</workflow-app>
3.2.6.1 Overriding an action’s Main class
This feature is useful for developers to change the Main classes without having to recompile or redeploy Oozie.
For most actions (not just the Java action), you can override the Main class it uses by specifying the following configuration property and making sure that your class is included in the workflow’s classpath. If you specify this in the Java action, the main-class element has priority.
<property> <name>oozie.launcher.action.main.class</name> <value>org.my.CustomMain</value> </property>
Note: Most actions typically pass information to their corresponding Main in specific ways; you should look at the action’s existing Main to see how it works before creating your own. In fact, its probably simplest to just subclass the existing Main and add/modify/overwrite any behavior you want to change.
4 Parameterization of Workflows
Workflow definitions can be parameterized.
When workflow node is executed by Oozie all the ELs are resolved into concrete values.
The parameterization of workflow definitions it done using JSP Expression Language syntax from the JSP 2.0 Specification (JSP.2.3), allowing not only to support variables as parameters but also functions and complex expressions.
EL expressions can be used in the configuration values of action and decision nodes. They can be used in XML attribute values and in XML element and attribute values.
They cannot be used in XML element and attribute names. They cannot be used in the name of a node and they cannot be used within the transition elements of a node.
4.1 Workflow Job Properties (or Parameters)
When a workflow job is submitted to Oozie, the submitter may specify as many workflow job properties as required (similar to Hadoop JobConf properties).
Workflow applications may define default values for the workflow job or action parameters. They must be defined in a config-default.xml file bundled with the workflow application archive (refer to section ‘7 Workflow Applications Packaging’). Job or action properties specified in the workflow definition have precedence over the default values.
Properties that are a valid Java identifier, [A-Za-z_][0-9A-Za-z_]*, are available as ‘${NAME}’ variables within the workflow definition.
Properties that are not valid Java Identifier, for example ‘job.tracker’, are available via the String wf:conf(String name) function. Valid identifier properties are available via this function as well.
Using properties that are valid Java identifiers result in a more readable and compact definition.
By using properties Example:
Parameterized Workflow definition:
<workflow-app name='hello-wf' xmlns="uri:oozie:workflow:1.0">
...
<action name='firstjob'>
<map-reduce>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>com.foo.FirstMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>com.foo.FirstReducer</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>${inputDir}</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>${outputDir}</value>
</property>
</configuration>
</map-reduce>
<ok to='secondjob'/>
<error to='killcleanup'/>
</action>
...
</workflow-app>
When submitting a workflow job for the workflow definition above, 3 workflow job properties must be specified:
- resourceManager:
- inputDir:
- outputDir:
If the above 3 properties are not specified, the job will fail.
As of schema 0.4, a list of formal parameters can be provided which will allow Oozie to verify, at submission time, that said properties are actually specified (i.e. before the job is executed and fails). Default values can also be provided.
Example:
The previous parameterized workflow definition with formal parameters:
<workflow-app name='hello-wf' xmlns="uri:oozie:workflow:1.0">
<parameters>
<property>
<name>inputDir</name>
</property>
<property>
<name>outputDir</name>
<value>out-dir</value>
</property>
</parameters>
...
<action name='firstjob'>
<map-reduce>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>com.foo.FirstMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>com.foo.FirstReducer</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>${inputDir}</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>${outputDir}</value>
</property>
</configuration>
</map-reduce>
<ok to='secondjob'/>
<error to='killcleanup'/>
</action>
...
</workflow-app>
In the above example, if inputDir is not specified, Oozie will print an error message instead of submitting the job. If outputDir is not specified, Oozie will use the default value, out-dir.
4.2 Expression Language Functions
Oozie, besides allowing the use of workflow job properties to parameterize workflow jobs, it provides a set of build in EL functions that enable a more complex parameterization of workflow action nodes as well as the predicates in decision nodes.
4.2.1 Basic EL Constants
- KB: 1024, one kilobyte.
- MB: 1024 *** KB, one megabyte.
- GB: 1024 *** MB, one gigabyte.
- TB: 1024 *** GB, one terabyte.
- PB: 1024 *** TG, one petabyte.
All the above constants are of type long.
4.2.2 Basic EL Functions
String firstNotNull(String value1, String value2)
It returns the first not null value, or null if both are null.
Note that if the output of this function is null and it is used as string, the EL library converts it to an empty string. This is the common behavior when using firstNotNull() in node configuration sections.
String concat(String s1, String s2)
It returns the concatenation of 2 strings. A string with null value is considered as an empty string.
String replaceAll(String src, String regex, String replacement)
Replace each occurrence of regular expression match in the first string with the replacement string and return the replaced string. A ‘regex’ string with null value is considered as no change. A ‘replacement’ string with null value is consider as an empty string.
String appendAll(String src, String append, String delimeter)
Add the append string into each splitted sub-strings of the first string(src). The split is performed into src string using the delimiter. E.g. appendAll("/a/b/,/c/b/,/c/d/", "ADD", ",") will return /a/b/ADD,/c/b/ADD,/c/d/ADD. A append string with null value is consider as an empty string. A delimiter string with value null is considered as no append in the string.
String trim(String s)
It returns the trimmed value of the given string. A string with null value is considered as an empty string.
String urlEncode(String s)
It returns the URL UTF-8 encoded value of the given string. A string with null value is considered as an empty string.
String timestamp()
It returns the current datetime in ISO8601 format, down to minutes (yyyy-MM-ddTHH:mmZ), in the Oozie’s processing timezone, i.e. 1997-07-16T19:20Z
String toJsonStr(Map<String, String>) (since Oozie 3.3)
It returns an XML encoded JSON representation of a Map<String, String>. This function is useful to encode as a single property the complete action-data of an action, wf:actionData(String actionName), in order to pass it in full to another action.
String toPropertiesStr(Map<String, String>) (since Oozie 3.3)
It returns an XML encoded Properties representation of a Map<String, String>. This function is useful to encode as a single property the complete action-data of an action, wf:actionData(String actionName), in order to pass it in full to another action.
String toConfigurationStr(Map<String, String>) (since Oozie 3.3)
It returns an XML encoded Configuration representation of a Map<String, String>. This function is useful to encode as a single property the complete action-data of an action, wf:actionData(String actionName), in order to pass it in full to another action.
4.2.3 Workflow EL Functions
String wf:id()
It returns the workflow job ID for the current workflow job.
String wf:name()
It returns the workflow application name for the current workflow job.
String wf:appPath()
It returns the workflow application path for the current workflow job.
String wf:conf(String name)
It returns the value of the workflow job configuration property for the current workflow job, or an empty string if undefined.
String wf:user()
It returns the user name that started the current workflow job.
String wf:group()
It returns the group/ACL for the current workflow job.
String wf:callback(String stateVar)
It returns the callback URL for the current workflow action node, stateVar can be a valid exit state (OK or ERROR) for the action or a token to be replaced with the exit state by the remote system executing the task.
String wf:transition(String node)
It returns the transition taken by the specified workflow action node, or an empty string if the action has not being executed or it has not completed yet.
String wf:lastErrorNode()
It returns the name of the last workflow action node that exit with an ERROR exit state, or an empty string if no action has exited with ERROR state in the current workflow job.
String wf:errorCode(String node)
It returns the error code for the specified action node, or an empty string if the action node has not exited with ERROR state.
Each type of action node must define its complete error code list.
String wf:errorMessage(String message)
It returns the error message for the specified action node, or an empty string if no action node has not exited with ERROR state.
The error message can be useful for debugging and notification purposes.
int wf:run()
It returns the run number for the current workflow job, normally 0 unless the workflow job is re-run, in which case indicates the current run.
Map<String, String> wf:actionData(String node)
This function is only applicable to action nodes that produce output data on completion.
The output data is in a Java Properties format and via this EL function it is available as a Map<String, String>.
String wf:actionExternalId(String node)
It returns the external Id for an action node, or an empty string if the action has not being executed or it has not completed yet.
String wf:actionTrackerUri(String node)
It returns the tracker URI for an action node, or an empty string if the action has not being executed or it has not completed yet.
String wf:actionExternalStatus(String node)
It returns the external status for an action node, or an empty string if the action has not being executed or it has not completed yet.
4.2.4 Hadoop EL Constants
- RECORDS: Hadoop record counters group name.
- MAP_IN: Hadoop mapper input records counter name.
- MAP_OUT: Hadoop mapper output records counter name.
- REDUCE_IN: Hadoop reducer input records counter name.
- REDUCE_OUT: Hadoop reducer input record counter name.
- GROUPS: 1024 *** Hadoop mapper/reducer record groups counter name.
4.2.5 Hadoop EL Functions
Map < String, Map < String, Long > > hadoop:counters(String node)
It returns the counters for a job submitted by a Hadoop action node. It returns 0 if the if the Hadoop job has not started yet and for undefined counters.
The outer Map key is a counter group name. The inner Map value is a Map of counter names and counter values.
The Hadoop EL constants defined in the previous section provide access to the Hadoop built in record counters.
This function can also be used to access specific action statistics information. Examples of action stats and their usage through EL Functions (referenced in workflow xml) are given below.
Example of MR action stats:
{
"ACTION_TYPE": "MAP_REDUCE",
"org.apache.hadoop.mapred.JobInProgress$Counter": {
"TOTAL_LAUNCHED_REDUCES": 1,
"TOTAL_LAUNCHED_MAPS": 1,
"DATA_LOCAL_MAPS": 1
},
"FileSystemCounters": {
"FILE_BYTES_READ": 1746,
"HDFS_BYTES_READ": 1409,
"FILE_BYTES_WRITTEN": 3524,
"HDFS_BYTES_WRITTEN": 1547
},
"org.apache.hadoop.mapred.Task$Counter": {
"REDUCE_INPUT_GROUPS": 33,
"COMBINE_OUTPUT_RECORDS": 0,
"MAP_INPUT_RECORDS": 33,
"REDUCE_SHUFFLE_BYTES": 0,
"REDUCE_OUTPUT_RECORDS": 33,
"SPILLED_RECORDS": 66,
"MAP_OUTPUT_BYTES": 1674,
"MAP_INPUT_BYTES": 1409,
"MAP_OUTPUT_RECORDS": 33,
"COMBINE_INPUT_RECORDS": 0,
"REDUCE_INPUT_RECORDS": 33
}
}
Below is the workflow that describes how to access specific information using hadoop:counters() EL function from the MR stats. Workflow xml:
<workflow-app xmlns="uri:oozie:workflow:1.0" name="map-reduce-wf">
<start to="mr-node"/>
<action name="mr-node">
<map-reduce>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${nameNode}/user/${wf:user()}/${examplesRoot}/output-data/${outputDir}"/>
</prepare>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
<property>
<name>mapred.mapper.class</name>
<value>org.apache.oozie.example.SampleMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>org.apache.oozie.example.SampleReducer</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>/user/${wf:user()}/${examplesRoot}/input-data/text</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/user/${wf:user()}/${examplesRoot}/output-data/${outputDir}</value>
</property>
<property>
<name>oozie.action.external.stats.write</name>
<value>true</value>
</property>
</configuration>
</map-reduce>
<ok to="java1"/>
<error to="fail"/>
</action>
<action name="java1">
<java>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
</configuration>
<main-class>MyTest</main-class>
<arg> ${hadoop:counters("mr-node")["FileSystemCounters"]["FILE_BYTES_READ"]}</arg>
<capture-output/>
</java>
<ok to="end" />
<error to="fail" />
</action>
<kill name="fail">
<message>Map/Reduce failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
</workflow-app>
Example of Pig action stats:
{
"ACTION_TYPE": "PIG",
"JOB_GRAPH": "job_201112191708_0008",
"PIG_VERSION": "0.9.0",
"FEATURES": "UNKNOWN",
"ERROR_MESSAGE": null,
"NUMBER_JOBS": "1",
"RECORD_WRITTEN": "33",
"BYTES_WRITTEN": "1410",
"HADOOP_VERSION": "0.20.2",
"SCRIPT_ID": "bbe016e9-f678-43c3-96fc-f24359957582",
"PROACTIVE_SPILL_COUNT_RECORDS": "0",
"PROACTIVE_SPILL_COUNT_OBJECTS": "0",
"RETURN_CODE": "0",
"ERROR_CODE": "-1",
"SMM_SPILL_COUNT": "0",
"DURATION": "36850",
"job_201112191708_0008": {
"MAP_INPUT_RECORDS": "33",
"MIN_REDUCE_TIME": "0",
"MULTI_STORE_COUNTERS": {},
"MAX_REDUCE_TIME": "0",
"NUMBER_REDUCES": "0",
"ERROR_MESSAGE": null,
"RECORD_WRITTEN": "33",
"HDFS_BYTES_WRITTEN": "1410",
"JOB_ID": "job_201112191708_0008",
"REDUCE_INPUT_RECORDS": "0",
"AVG_REDUCE_TIME": "0",
"MAX_MAP_TIME": "9169",
"BYTES_WRITTEN": "1410",
"Alias": "A,B",
"REDUCE_OUTPUT_RECORDS": "0",
"SMMS_SPILL_COUNT": "0",
"PROACTIVE_SPILL_COUNT_RECS": "0",
"PROACTIVE_SPILL_COUNT_OBJECTS": "0",
"HADOOP_COUNTERS": null,
"MIN_MAP_TIME": "9169",
"MAP_OUTPUT_RECORDS": "33",
"AVG_MAP_TIME": "9169",
"FEATURE": "MAP_ONLY",
"NUMBER_MAPS": "1"
}
}
Below is the workflow that describes how to access specific information using hadoop:counters() EL function from the Pig stats. Workflow xml:
<workflow-app xmlns="uri:oozie:workflow:1.0" name="pig-wf">
<start to="pig-node"/>
<action name="pig-node">
<pig>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${nameNode}/user/${wf:user()}/${examplesRoot}/output-data/pig"/>
</prepare>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
<property>
<name>oozie.action.external.stats.write</name>
<value>true</value>
</property>
</configuration>
<script>id.pig</script>
<param>INPUT=/user/${wf:user()}/${examplesRoot}/input-data/text</param>
<param>OUTPUT=/user/${wf:user()}/${examplesRoot}/output-data/pig</param>
</pig>
<ok to="java1"/>
<error to="fail"/>
</action>
<action name="java1">
<java>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
</configuration>
<main-class>MyTest</main-class>
<arg> ${hadoop:counters("pig-node")["JOB_GRAPH"]}</arg>
<capture-output/>
</java>
<ok to="end" />
<error to="fail" />
</action>
<kill name="fail">
<message>Pig failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
</workflow-app>
String hadoop:conf(String hadoopConfHostPort, String propName)
It returns the value of a property of Hadoop configuration.
The hadoopConfHostPort is the ‘host:port’ of a Hadoop cluster, such as ‘NameNodeHostAddress:Port’ and ‘JobTrackerHostAddress:Port’. The propName is the name of target property. If hadoopConfHostPort could be connected, Hadoop Conf EL Function will return the value of propName from the specific host address and port. If hadoopConfHostPort could not be connected, Hadoop Conf EL Function will generate a default hadoop configuration object directly, and then return the value of target property.
Example of usage of Hadoop Configuration EL Function:
<action name="mr-node">
<map-reduce>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapreduce.map.java.opts</name>
<value>${hadoop:conf("9.181.7.69:9001","mapreduce.map.java.opts")} -Xss512k </value>
</property>
</configuration>
</map-reduce>
<ok to="end"/>
<error to="fail"/>
</action>
4.2.6 Hadoop Jobs EL Function
The function wf:actionData() can be used to access Hadoop ID’s for actions such as Pig, by specifying the key as hadoopJobs. An example is shown below.
<workflow-app xmlns="uri:oozie:workflow:1.0" name="pig-wf">
<start to="pig-node"/>
<action name="pig-node">
<pig>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${nameNode}/user/${wf:user()}/${examplesRoot}/output-data/pig"/>
</prepare>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
</configuration>
<script>id.pig</script>
<param>INPUT=/user/${wf:user()}/${examplesRoot}/input-data/text</param>
<param>OUTPUT=/user/${wf:user()}/${examplesRoot}/output-data/pig</param>
</pig>
<ok to="java1"/>
<error to="fail"/>
</action>
<action name="java1">
<java>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
</configuration>
<main-class>MyTest</main-class>
<arg> ${wf:actionData("pig-node")["hadoopJobs"]}</arg>
<capture-output/>
</java>
<ok to="end" />
<error to="fail" />
</action>
<kill name="fail">
<message>Pig failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
</workflow-app>
4.2.7 HDFS EL Functions
For all the functions in this section the path must include the FS URI. For example hdfs://foo:8020/user/tucu.
boolean fs:exists(String path)
It returns true or false depending if the specified path URI exists or not. If a glob pattern is used for the URI, it returns true when there is at least one matching path.
boolean fs:isDir(String path)
It returns true if the specified path URI exists and it is a directory, otherwise it returns false.
long fs:dirSize(String path)
It returns the size in bytes of all the files in the specified path. If the path is not a directory, or if it does not exist it returns -1. It does not work recursively, only computes the size of the files under the specified path.
long fs:fileSize(String path)
It returns the size in bytes of specified file. If the path is not a file, or if it does not exist it returns -1.
long fs:blockSize(String path)
It returns the block size in bytes of specified file. If the path is not a file, or if it does not exist it returns -1.
4.2.8 HCatalog EL Functions
For all the functions in this section the URI must be a hcatalog URI identifying a table or set of partitions in a table. The format for specifying hcatalog table URI is hcat://[metastore server]:[port]/[database name]/[table name] and format to specify a hcatalog table partition URI is hcat://[metastore server]:[port]/[database name]/[table name]/[partkey1]=[value];[partkey2]=[value]. For example:
hcat://foo:8020/mydb/mytable hcat://foo:8020/mydb/mytable/region=us;dt=20121212
boolean hcat:exists(String uri)
It returns true or false based on if the partitions in the table exists or not.
5 Workflow Notifications
Workflow jobs can be configured to make an HTTP GET notification upon start and end of a workflow action node and upon the completion of a workflow job.
Oozie will make a best effort to deliver the notifications, in case of failure it will retry the notification a pre-configured number of times at a pre-configured interval before giving up.
See also Coordinator Notifications
5.1 Workflow Job Status Notification
If the oozie.wf.workflow.notification.url property is present in the workflow job properties when submitting the job, Oozie will make a notification to the provided URL when the workflow job changes its status. oozie.wf.workflow.notification.proxy property can be used to configure either a http or socks proxy. The format is proxyHostname:port or proxyType@proxyHostname:port. If proxy type is not specified, it defaults to http. For eg: myhttpproxyhost.mydomain.com:80 or [email protected]:1080.
If the URL contains any of the following tokens, they will be replaced with the actual values by Oozie before making the notification:
- $jobId : The workflow job ID
- $status : the workflow current state
- $parentId : The parent ID of the workflow job. If there is no parent ID, it will be replaced with an empty string.
5.2 Node Start and End Notifications
If the oozie.wf.action.notification.url property is present in the workflow job properties when submitting the job, Oozie will make a notification to the provided URL every time the workflow job enters and exits an action node. For decision nodes, Oozie will send a single notification with the name of the first evaluation that resolved to true. oozie.wf.workflow.notification.proxy property can be used to configure proxy, it should contain proxy host and port (xyz:4080).
If the URL contains any of the following tokens, they will be replaced with the actual values by Oozie before making the notification:
- $jobId : The workflow job ID
- $nodeName : The name of the workflow node
- $status : If the action has not completed yet, it contains the action status S:<STATUS>. If the action has ended, it contains the action transition T:<TRANSITION>
6 User Propagation
When submitting a workflow job, the configuration must contain a user.name property. If security is enabled, Oozie must ensure that the value of the user.name property in the configuration match the user credentials present in the protocol (web services) request.
When submitting a workflow job, the configuration may contain the oozie.job.acl property (the group.name property has been deprecated). If authorization is enabled, this property is treated as as the ACL for the job, it can contain user and group IDs separated by commas.
The specified user and ACL are assigned to the created job.
Oozie must propagate the specified user and ACL to the system executing the actions.
It is not allowed for map-reduce, pig and fs actions to override user/group information.
7 Workflow Application Deployment
While Oozie encourages the use of self-contained applications (J2EE application model), it does not enforce it.
Workflow applications are installed in an HDFS directory. To submit a job for a workflow application the path to the HDFS directory where the application is must be specified.
The layout of a workflow application directory is:
- /workflow.xml
- /config-default.xml
|
- /lib/ (**.jar;**.so)
A workflow application must contain at least the workflow definition, the workflow.xml file.
All configuration files and scripts (Pig and shell) needed by the workflow action nodes should be under the application HDFS directory.
All the JAR files and native libraries within the application ‘lib/’ directory are automatically added to the map-reduce and pig jobs classpath and LD_PATH.
Additional JAR files and native libraries not present in the application ‘lib/’ directory can be specified in map-reduce and pig actions with the ‘file’ element (refer to the map-reduce and pig documentation).
For Map-Reduce jobs (not including streaming or pipes), additional jar files can also be included via an uber jar. An uber jar is a jar file that contains additional jar files within a “lib” folder. To let Oozie know about an uber jar, simply specify it with the oozie.mapreduce.uber.jar configuration property and Oozie will tell Hadoop MapReduce that it is an uber jar. The ability to specify an uber jar is governed by the oozie.action.mapreduce.uber.jar.enable property in oozie-site.xml. See Oozie Install for more information.
<action name="mr-node">
<map-reduce>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${nameNode}</name-node>
<configuration>
<property>
<name>oozie.mapreduce.uber.jar</name>
<value>${nameNode}/user/${wf:user()}/my-uber-jar.jar</value>
</property>
</configuration>
</map-reduce>
<ok to="end"/>
<error to="fail"/>
</action>
The config-default.xml file defines, if any, default values for the workflow job or action parameters. This file must be in the Hadoop Configuration XML format. EL expressions are not supported and user.name property cannot be specified in this file.
Any other resources like job.xml files referenced from a workflow action node must be included under the corresponding path, relative paths always start from the root of the workflow application.
8 External Data Assumptions
Oozie runs workflow jobs under the assumption all necessary data to execute an action is readily available at the time the workflow job is about to executed the action.
In addition, it is assumed, but it is not the responsibility of Oozie, that all input data used by a workflow job is immutable for the duration of the workflow job.
9 Workflow Jobs Lifecycle
9.1 Workflow Job Lifecycle
A workflow job can be in any of the following states:
PREP: When a workflow job is first created it will be in PREP state. The workflow job is defined but it is not running.
RUNNING: When a CREATED workflow job is started it goes into RUNNING state, it will remain in RUNNING state until it reaches its end state, ends in error or is suspended.
SUSPENDED: A RUNNING workflow job can be suspended, it will remain in SUSPENDED state until the workflow job is resumed or it is killed.
SUCCEEDED: When a RUNNING workflow job reaches the end node it ends reaching the SUCCEEDED final state.
KILLED: When a CREATED, RUNNING or SUSPENDED workflow job is killed by an administrator or the owner via a request to Oozie the workflow job ends reaching the KILLED final state.
FAILED: When a RUNNING workflow job fails due to an unexpected error it ends reaching the FAILED final state.
Workflow job state valid transitions:
- –> PREP
- PREP –> RUNNING | KILLED
- RUNNING –> SUSPENDED | SUCCEEDED | KILLED | FAILED
- SUSPENDED –> RUNNING | KILLED
9.2 Workflow Action Lifecycle
When a workflow action is created, it is in the PREP state. If an attempt to start it succeeds, it transitions to the RUNNING state; if the attempt fails in a way that Oozie deems to be transient, and a non-zero number of retries is configured, it enters the START_RETRY state and Oozie automatically retries the action until it either succeeds or the configured number of retries is reached. If the error is not transient or still persists after the retries, the job transitions to the START_MANUAL state, where the user is expected to either kill the action or manually resume it (after fixing any issues).
From the RUNNING state, the action normally transitions to the DONE state. From DONE, it goes to OK if it ends successfully, otherwise to ERROR or USER_RETRY.
If an error is encountered while Oozie is trying to end the action, the action transitions to the END_RETRY state if the error is transient and a non-zero number of retries is configured, or to the END_MANUAL state if it is not. In the END_RETRY state, Oozie automatically retries ending the action until it either succeeds or the configured number of retries is reached. If the error persists, the action goes to the END_MANUAL state, where the user is expected to either kill the action or manually resume it (after fixing any issues).
The USER_RETRY state is used when retrying actions where the user has explicitly configured the number (and/or other properties) of retries. For more information, see User-Retry for Workflow Actions. From USER_RETRY, the action goes back to RUNNING and a retry is attempted. After the configured number of user retries, if the action is still failing, it goes to the ERROR state.
If an action is killed, it transitions to the KILLED state. If there is an error while attempting to kill the action, it goes to the FAILED state.
Workflow action state valid transitions:
- –> PREP
- PREP –> START_RETRY | START_MANUAL | RUNNING | KILLED
- START_RETRY –> START_MANUAL | RUNNING | KILLED
- START_MANUAL –> RUNNING | KILLED
- USER_RETRY –> RUNNING | DONE | KILLED
- RUNNING –> DONE | KILLED
- KILLED –> FAILED
- DONE –> OK | ERROR | USER_RETRY | END_RETRY | END_MANUAL
- END_RETRY –> END_MANUAL | KILLED | OK | ERROR
- END_MANUAL –> KILLED | OK | ERROR
10 Workflow Jobs Recovery (re-run)
Oozie must provide a mechanism by which a failed workflow job can be resubmitted and executed starting after any action node that has completed its execution in the prior run. This is specially useful when the already executed action of a workflow job are too expensive to be re-executed.
It is the responsibility of the user resubmitting the workflow job to do any necessary cleanup to ensure that the rerun will not fail due to not cleaned up data from the previous run.
When starting a workflow job in recovery mode, the user must indicate either what workflow nodes in the workflow should be skipped or whether job should be restarted from the failed node. At any rerun, only one option should be selected. The workflow nodes to skip must be specified in the oozie.wf.rerun.skip.nodes job configuration property, node names must be separated by commas. On the other hand, user needs to specify oozie.wf.rerun.failnodes to rerun from the failed node. The value is true or false. All workflow nodes indicated as skipped must have completed in the previous run. If a workflow node has not completed its execution in its previous run, and during the recovery submission is flagged as a node to be skipped, the recovery submission must fail.
The recovery workflow job will run under the same workflow job ID as the original workflow job.
To submit a recovery workflow job the target workflow job to recover must be in an end state (SUCCEEDED, FAILED or KILLED).
A recovery run could be done using a new workflow application path under certain constraints (see next paragraph). This is to allow users to do a one off patch for the workflow application without affecting other running jobs for the same application.
A recovery run could be done using different workflow job parameters, the new values of the parameters will take effect only for the workflow nodes executed in the rerun.
The workflow application use for a re-run must match the execution flow, node types, node names and node configuration for all executed nodes that will be skipped during recovery. This cannot be checked by Oozie, it is the responsibility of the user to ensure this is the case.
Oozie provides the int wf:run() EL function to returns the current run for a job, this function allows workflow applications to perform custom logic at workflow definition level (i.e. in a decision node) or at action node level (i.e. by passing the value of the wf:run() function as a parameter to the task).
11 Oozie Web Services API
See the Web Services API page.
12 Client API
Oozie provides a Java Client API that allows to perform all common workflow job operations.
The client API includes a LocalOozie class useful for testing a workflow from within an IDE and for unit testing purposes.
The Client API is implemented as a client of the Web Services API.
13 Command Line Tools
Oozie provides command line tool that allows to perform all common workflow job operations.
The command line tool is implemented as a client of the Web Services API.
14 Web UI Console
Oozie provides a read-only Web based console that allows to allow to monitor Oozie system status, workflow applications status and workflow jobs status.
The Web base console is implemented as a client of the Web Services API.
15 Customizing Oozie with Extensions
Out of the box Oozie provides support for a predefined set of action node types and Expression Language functions.
Oozie provides a well defined API, Action executor API, to add support for additional action node types.
Extending Oozie should not require any code change to the Oozie codebase. It will require adding the JAR files providing the new functionality and declaring them in Oozie system configuration.
16 Workflow Jobs Priority
Oozie does not handle workflow jobs priority. As soon as a workflow job is ready to do a transition, Oozie will trigger the transition. Workflow transitions and action triggering are assumed to be fast and lightweight operations.
Oozie assumes that the remote systems are properly sized to handle the amount of remote jobs Oozie will trigger.
Any prioritization of jobs in the remote systems is outside of the scope of Oozie.
Workflow applications can influence the remote systems priority via configuration if the remote systems support it.
17 HDFS Share Libraries for Workflow Applications (since Oozie 2.3)
Oozie supports job and system share libraries for workflow jobs.
Share libraries can simplify the deployment and management of common components across workflow applications.
For example, if a workflow job uses a share library with the Streaming, Pig & Har JARs files it does not have to bundled those JARs files in the workflow application lib/ path.
If workflow job uses a share library, Oozie will include all the JAR/SO files in the library in the classpath/libpath for all its actions.
A workflow job can specify a share library path using the job property oozie.libpath.
A workflow job can use the system share library by setting the job property oozie.use.system.libpath to true. oozie.use.system.libpath can be also configured at action configuration. oozie.use.system.libpath defined at action level overrides job property.
17.1 Action Share Library Override (since Oozie 3.3)
Oozie share libraries are organized per action type, for example Pig action share library directory is share/lib/pig/ and Mapreduce Streaming share library directory is share/library/mapreduce-streaming/.
Oozie bundles a share library for specific versions of streaming, pig, hive, sqoop, distcp actions. These versions of streaming, pig, hive, sqoop and distcp have been tested and verified to work correctly with the version of Oozie that includes them. Oozie also bundles a separate share library for hcatalog, which can be used with pig, hive and java actions (since Oozie 4.x).
In addition, Oozie provides a mechanism to override the action share library JARs to allow using an alternate version of of the action JARs.
This mechanism enables Oozie administrators to patch share library JARs, to include alternate versions of the share libraries, to provide access to more than one version at the same time.
The share library override is supported at server level and at job level. The share library directory names are resolved using the following precedence order:
- oozie.action.sharelib.for.#ACTIONTYPE# in the action configuration
- oozie.action.sharelib.for.#ACTIONTYPE# in the job configuration
- oozie.action.sharelib.for.#ACTIONTYPE# in the oozie server configuration
- The action or custom action’s ActionExecutor getDefaultShareLibName() method
More than one share library directory name can be specified for an action by using a comma separated list (since Oozie 4.x). For example: When using HCatLoader and HCatStorer in pig, oozie.action.sharelib.for.pig can be set to pig,hcatalog to include both pig and hcatalog jars.
18 User-Retry for Workflow Actions (since Oozie 3.1)
Oozie provides User-Retry capabilities when an action is in ERROR or FAILED state.
Depending on the nature of the failure, Oozie can define what type of errors allowed for User-Retry. There are certain errors Oozie is allowing for user-retry in default, for example, file-exists-error FS009, FS008 when using chmod in workflow fs action, output-directory-exists-error JA018 in workflow map-reduce action, job-not-exists-error JA017 in action executor, FileNotFoundException JA008 in action executor, and IOException JA009 in action executor.
User-Retry allows user to give certain number of reties (must not exceed system max retries), so user can find the causes of that problem and fix them when action is in USER_RETRY state. If failure or error does not go away after max retries, the action becomes FAILED or ERROR and Oozie marks workflow job to FAILED or KILLED.
Oozie administrator can allow more error codes to be handled for User-Retry. By adding this configuration oozie.service.LiteWorkflowStoreService.user.retry.error.code.ext to oozie.site.xml and error codes as value, these error codes will be considered as User-Retry after system restart.
Since Oozie 4.3, User-retry allows user to mention retry policy. The value for policy can be periodic or exponential, periodic being the default. Oozie administrator can define user retry policy for all workflow actions by adding this configuration oozie.service.LiteWorkflowStoreService.user.retry.policy to oozie.site.xml. This value will be considered as user retry policy after system restart. This value can be overridden while defining actions in workflow xml if needed. The retry-interval should be specified in minutes.
Examples of User-Retry in a workflow action is :
<workflow-app xmlns="uri:oozie:workflow:1.0" name="wf-name"> <action name="a" retry-max="2" retry-interval="1" retry-policy="exponential"> </action>
19 Global Configurations
Oozie allows a global section to reduce the redundant resource-manager and name-node declarations for each action. The user can define a global section in the beginning of the workflow.xml. The global section may contain the job-xml, configuration, resource-manager, or name-node that the user would like to set for every action. If a user then redefines one of these in a specific action node, Oozie will update use the specific declaration instead of the global one for that action.
Example of a global element:
<workflow-app xmlns="uri:oozie:workflow:1.0" name="wf-name">
<global>
<resource-manager>${resourceManager}</resource-manager>
<name-node>${namd-node}</name-node>
<job-xml>job1.xml</job-xml>
<configuration>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
</configuration>
</global>
...
20 Suspend On Nodes
Specifying oozie.suspend.on.nodes in a job.properties file lets users specify a list of actions that will cause Oozie to automatically suspend the workflow upon reaching any of those actions; like breakpoints in a debugger. To continue running the workflow, the user simply uses the -resume command from the Oozie CLI. Specifying a * will cause Oozie to suspend the workflow on all nodes.
For example:
oozie.suspend.on.nodes=mr-node,my-pig-action,my-fork
Specifying the above in a job.properties file will cause Oozie to suspend the workflow when any of those three actions are about to be executed.
Appendixes
Appendix A, Oozie Workflow and Common XML Schemas
Oozie Workflow Schema Version 1.0
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:1.0"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:1.0">
.
<xs:include schemaLocation="oozie-common-1.0.xsd"/>
.
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
.
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39}"/>
</xs:restriction>
</xs:simpleType>
.
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="parameters" type="workflow:PARAMETERS" minOccurs="0" maxOccurs="1"/>
<xs:element name="global" type="workflow:GLOBAL" minOccurs="0" maxOccurs="1"/>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1 uri:oozie:sla:0.2" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>
.
<xs:complexType name="PARAMETERS">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="0" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="GLOBAL">
<xs:sequence>
<xs:choice>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="resource-manager" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="launcher" type="workflow:LAUNCHER" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
.
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:element name="kill" type="workflow:KILL"/>
.
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
.
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
.
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1 uri:oozie:sla:0.2" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
<xs:attribute name="retry-max" type="xs:string"/>
<xs:attribute name="retry-interval" type="xs:string"/>
<xs:attribute name="retry-policy" type="xs:string"/>
</xs:complexType>
.
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:choice>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="resource-manager" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="launcher" type="workflow:LAUNCHER" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="config-class" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="PIG">
<xs:sequence>
<xs:choice>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="resource-manager" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="launcher" type="workflow:LAUNCHER" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="delete" type="workflow:DELETE"/>
<xs:element name="mkdir" type="workflow:MKDIR"/>
<xs:element name="move" type="workflow:MOVE"/>
<xs:element name="chmod" type="workflow:CHMOD"/>
<xs:element name="touchz" type="workflow:TOUCHZ"/>
<xs:element name="chgrp" type="workflow:CHGRP"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="JAVA">
<xs:sequence>
<xs:choice>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="resource-manager" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="launcher" type="workflow:LAUNCHER" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="java-opts" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opt" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:choice>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
.
</xs:schema>
Oozie Common Schema Version 1.0
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
.
<xs:complexType name="LAUNCHER">
<xs:choice maxOccurs="unbounded">
<!-- Oozie Launcher job memory in MB -->
<xs:element name="memory.mb" minOccurs="0" type="xs:unsignedInt"/>
<xs:element name="vcores" minOccurs="0" type="xs:unsignedInt"/>
<xs:element name="java-opts" minOccurs="0" type="xs:string"/>
<xs:element name="env" minOccurs="0" type="xs:string"/>
<xs:element name="queue" minOccurs="0" type="xs:string"/>
<xs:element name="sharelib" minOccurs="0" type="xs:string"/>
<xs:element name="view-acl" minOccurs="0" type="xs:string"/>
<xs:element name="modify-acl" minOccurs="0" type="xs:string"/>
</xs:choice>
</xs:complexType>
.
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
.
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
.
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
.
<xs:complexType name="FLAG"/>
.
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
.
<xs:complexType name="CHMOD">
<xs:sequence>
<xs:element name="recursive" type="FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
.
<xs:complexType name="TOUCHZ">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
.
<xs:complexType name="CHGRP">
<xs:sequence>
<xs:element name="recursive" type="FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="group" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
.
</xs:schema>
Oozie Workflow Schema Version 0.5
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.5"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.5">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39}"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="parameters" type="workflow:PARAMETERS" minOccurs="0" maxOccurs="1"/>
<xs:element name="global" type="workflow:GLOBAL" minOccurs="0" maxOccurs="1"/>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1 uri:oozie:sla:0.2" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="PARAMETERS">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="0" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="GLOBAL">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1 uri:oozie:sla:0.2" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
<xs:attribute name="retry-max" type="xs:string"/>
<xs:attribute name="retry-interval" type="xs:string"/>
<xs:attribute name="retry-policy" type="xs:string"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="config-class" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="delete" type="workflow:DELETE"/>
<xs:element name="mkdir" type="workflow:MKDIR"/>
<xs:element name="move" type="workflow:MOVE"/>
<xs:element name="chmod" type="workflow:CHMOD"/>
<xs:element name="touchz" type="workflow:TOUCHZ"/>
<xs:element name="chgrp" type="workflow:CHGRP"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="java-opts" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opt" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:choice>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="skip-trash" type="xs:boolean" use="optional"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:sequence>
<xs:element name="recursive" type="workflow:FLAG" minOccurs="0" maxOccurs="1"></xs:element>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="TOUCHZ">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHGRP">
<xs:sequence>
<xs:element name="recursive" type="workflow:FLAG" minOccurs="0" maxOccurs="1"></xs:element>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="group" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
</xs:schema>
Oozie Workflow Schema Version 0.4.5
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.4.5"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.4.5">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39}"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="parameters" type="workflow:PARAMETERS" minOccurs="0" maxOccurs="1"/>
<xs:element name="global" type="workflow:GLOBAL" minOccurs="0" maxOccurs="1"/>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="PARAMETERS">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="0" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="GLOBAL">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
<xs:attribute name="retry-max" type="xs:string"/>
<xs:attribute name="retry-interval" type="xs:string"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="delete" type="workflow:DELETE"/>
<xs:element name="mkdir" type="workflow:MKDIR"/>
<xs:element name="move" type="workflow:MOVE"/>
<xs:element name="chmod" type="workflow:CHMOD"/>
<xs:element name="touchz" type="workflow:TOUCHZ"/>
<xs:element name="chgrp" type="workflow:CHGRP"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="java-opts" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opt" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:choice>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:sequence>
<xs:element name="recursive" type="workflow:FLAG" minOccurs="0" maxOccurs="1"></xs:element>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="TOUCHZ">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHGRP">
<xs:sequence>
<xs:element name="recursive" type="workflow:FLAG" minOccurs="0" maxOccurs="1"></xs:element>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="group" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
</xs:schema>
Oozie Workflow Schema Version 0.4
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.4"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.4">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39}"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="parameters" type="workflow:PARAMETERS" minOccurs="0" maxOccurs="1"/>
<xs:element name="global" type="workflow:GLOBAL" minOccurs="0" maxOccurs="1"/>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="PARAMETERS">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="0" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="GLOBAL">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
<xs:attribute name="retry-max" type="xs:string"/>
<xs:attribute name="retry-interval" type="xs:string"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="name-node" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="delete" type="workflow:DELETE"/>
<xs:element name="mkdir" type="workflow:MKDIR"/>
<xs:element name="move" type="workflow:MOVE"/>
<xs:element name="chmod" type="workflow:CHMOD"/>
<xs:element name="touchz" type="workflow:TOUCHZ"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opts" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:sequence>
<xs:element name="recursive" type="workflow:FLAG" minOccurs="0" maxOccurs="1"></xs:element>
</xs:sequence>
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
</xs:schema>
Oozie Workflow Schema Version 0.3
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.3"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.3">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39})"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
<xs:attribute name="retry-max" type="xs:string"/>
<xs:attribute name="retry-interval" type="xs:string"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="move" type="workflow:MOVE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="chmod" type="workflow:CHMOD" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opts" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
</xs:schema>
Oozie Workflow Schema Version 0.2.5
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.2.5"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.2.5">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39})"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="credentials" type="workflow:CREDENTIALS" minOccurs="0" maxOccurs="1"/>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="cred" type="xs:string"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="move" type="workflow:MOVE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="chmod" type="workflow:CHMOD" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opts" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:attribute name="path" type="xs:string" use="required"/>
<xs:attribute name="permissions" type="xs:string" use="required"/>
<xs:attribute name="dir-files" type="xs:string"/>
</xs:complexType>
<xs:complexType name="CREDENTIALS">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="credential" type="workflow:CREDENTIAL"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CREDENTIAL">
<xs:sequence minOccurs="0" maxOccurs="unbounded" >
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="type" type="xs:string" use="required"/>
</xs:complexType>
</xs:schema>
Oozie Workflow Schema Version 0.2
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.2"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.2">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z_]([\-_a-zA-Z0-9])*){1,39})"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="uri:oozie:sla:0.1" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="argument" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="move" type="workflow:MOVE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="chmod" type="workflow:CHMOD" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opts" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:attribute name="path" type="xs:string" use="required" />
<xs:attribute name="permissions" type="xs:string" use="required" />
<xs:attribute name="dir-files" type="xs:string" />
</xs:complexType>
</xs:schema>
Oozie SLA Version 0.2
- Supported in Oozie workflow schema version 0.5
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:sla="uri:oozie:sla:0.2" elementFormDefault="qualified"
targetNamespace="uri:oozie:sla:0.2">
<xs:element name="info" type="sla:SLA-INFO"/>
<xs:complexType name="SLA-INFO">
<xs:sequence>
<xs:element name="nominal-time" type="xs:string" minOccurs="1"
maxOccurs="1"/>
<xs:element name="should-start" type="xs:string" minOccurs="0"
maxOccurs="1"/>
<xs:element name="should-end" type="xs:string" minOccurs="1"
maxOccurs="1"/>
<xs:element name="max-duration" type="xs:string" minOccurs="0"
maxOccurs="1"/>
<xs:element name="alert-events" type="xs:string" minOccurs="0"
maxOccurs="1"/>
<xs:element name="alert-contact" type="xs:string" minOccurs="0"
maxOccurs="1"/>
<xs:element name="notification-msg" type="xs:string" minOccurs="0"
maxOccurs="1"/>
<xs:element name="upstream-apps" type="xs:string" minOccurs="0"
maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
Oozie SLA Version 0.1
- Oozie SLA schema is supported in Oozie workflow schema version 0.2 onwards
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:sla="uri:oozie:sla:0.1" elementFormDefault="qualified"
targetNamespace="uri:oozie:sla:0.1">
<xs:element name="info" type="sla:SLA-INFO" />
<xs:complexType name="SLA-INFO">
<xs:sequence>
<xs:element name="app-name" type="xs:string" minOccurs="1"
maxOccurs="1" />
<xs:element name="nominal-time" type="xs:string"
minOccurs="1" maxOccurs="1" />
<xs:element name="should-start" type="xs:string"
minOccurs="1" maxOccurs="1" />
<xs:element name="should-end" type="xs:string" minOccurs="1"
maxOccurs="1" />
<xs:element name="parent-client-id" type="xs:string"
minOccurs="0" maxOccurs="1" />
<xs:element name="parent-sla-id" type="xs:string"
minOccurs="0" maxOccurs="1" />
<xs:element name="notification-msg" type="xs:string"
minOccurs="0" maxOccurs="1" />
<xs:element name="alert-contact" type="xs:string"
minOccurs="1" maxOccurs="1" />
<xs:element name="dev-contact" type="xs:string" minOccurs="1"
maxOccurs="1" />
<xs:element name="qa-contact" type="xs:string" minOccurs="1"
maxOccurs="1" />
<xs:element name="se-contact" type="xs:string" minOccurs="1"
maxOccurs="1" />
<xs:element name="alert-frequency" type="sla:alert-frequencyType"
minOccurs="0" maxOccurs="1" />
<xs:element name="alert-percentage" type="sla:alert-percentageType"
minOccurs="0" maxOccurs="1" />
<xs:element name="upstream-apps" type="xs:string"
minOccurs="0" maxOccurs="1" />
</xs:sequence>
</xs:complexType>
<xs:simpleType name="alert-percentageType">
<xs:restriction base="xs:integer">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="100"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="alert-frequencyType">
<xs:restriction base="xs:string">
<xs:enumeration value="NONE"></xs:enumeration>
<xs:enumeration value="LAST_HOUR"></xs:enumeration>
<xs:enumeration value="LAST_DAY"></xs:enumeration>
<xs:enumeration value="LAST_MONTH"></xs:enumeration>
</xs:restriction>
</xs:simpleType>
</xs:schema>
Oozie Workflow Schema Version 0.1
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:workflow="uri:oozie:workflow:0.1"
elementFormDefault="qualified" targetNamespace="uri:oozie:workflow:0.1">
<xs:element name="workflow-app" type="workflow:WORKFLOW-APP"/>
<xs:simpleType name="IDENTIFIER">
<xs:restriction base="xs:string">
<xs:pattern value="([a-zA-Z]([\-_a-zA-Z0-9])*){1,39})"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="WORKFLOW-APP">
<xs:sequence>
<xs:element name="start" type="workflow:START" minOccurs="1" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="decision" type="workflow:DECISION" minOccurs="1" maxOccurs="1"/>
<xs:element name="fork" type="workflow:FORK" minOccurs="1" maxOccurs="1"/>
<xs:element name="join" type="workflow:JOIN" minOccurs="1" maxOccurs="1"/>
<xs:element name="kill" type="workflow:KILL" minOccurs="1" maxOccurs="1"/>
<xs:element name="action" type="workflow:ACTION" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="end" type="workflow:END" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="START">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="END">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="DECISION">
<xs:sequence>
<xs:element name="switch" type="workflow:SWITCH" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="switch" type="workflow:SWITCH"/>
<xs:complexType name="SWITCH">
<xs:sequence>
<xs:sequence>
<xs:element name="case" type="workflow:CASE" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="default" type="workflow:DEFAULT" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CASE">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="DEFAULT">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK_TRANSITION">
<xs:attribute name="start" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="FORK">
<xs:sequence>
<xs:element name="path" type="workflow:FORK_TRANSITION" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="JOIN">
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="kill" type="workflow:KILL"/>
<xs:complexType name="KILL">
<xs:sequence>
<xs:element name="message" type="xs:string" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="ACTION_TRANSITION">
<xs:attribute name="to" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:element name="map-reduce" type="workflow:MAP-REDUCE"/>
<xs:element name="pig" type="workflow:PIG"/>
<xs:element name="ssh" type="workflow:SSH"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW"/>
<xs:element name="fs" type="workflow:FS"/>
<xs:element name="java" type="workflow:JAVA"/>
<xs:complexType name="ACTION">
<xs:sequence>
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element name="map-reduce" type="workflow:MAP-REDUCE" minOccurs="1" maxOccurs="1"/>
<xs:element name="pig" type="workflow:PIG" minOccurs="1" maxOccurs="1"/>
<xs:element name="ssh" type="workflow:SSH" minOccurs="1" maxOccurs="1"/>
<xs:element name="sub-workflow" type="workflow:SUB-WORKFLOW" minOccurs="1" maxOccurs="1"/>
<xs:element name="fs" type="workflow:FS" minOccurs="1" maxOccurs="1"/>
<xs:element name="java" type="workflow:JAVA" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" minOccurs="1" maxOccurs="1"/>
</xs:choice>
<xs:element name="ok" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
<xs:element name="error" type="workflow:ACTION_TRANSITION" minOccurs="1" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="name" type="workflow:IDENTIFIER" use="required"/>
</xs:complexType>
<xs:complexType name="MAP-REDUCE">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:choice minOccurs="0" maxOccurs="1">
<xs:element name="streaming" type="workflow:STREAMING" minOccurs="0" maxOccurs="1"/>
<xs:element name="pipes" type="workflow:PIPES" minOccurs="0" maxOccurs="1"/>
</xs:choice>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIG">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="script" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="param" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SSH">
<xs:sequence>
<xs:element name="host" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="command" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="args" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="SUB-WORKFLOW">
<xs:sequence>
<xs:element name="app-path" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="propagate-configuration" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FS">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="move" type="workflow:MOVE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="chmod" type="workflow:CHMOD" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="JAVA">
<xs:sequence>
<xs:element name="job-tracker" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="name-node" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="prepare" type="workflow:PREPARE" minOccurs="0" maxOccurs="1"/>
<xs:element name="job-xml" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="configuration" type="workflow:CONFIGURATION" minOccurs="0" maxOccurs="1"/>
<xs:element name="main-class" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="java-opts" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="arg" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="file" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="archive" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="capture-output" type="workflow:FLAG" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="FLAG"/>
<xs:complexType name="CONFIGURATION">
<xs:sequence>
<xs:element name="property" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="value" minOccurs="1" maxOccurs="1" type="xs:string"/>
<xs:element name="description" minOccurs="0" maxOccurs="1" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="STREAMING">
<xs:sequence>
<xs:element name="mapper" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reducer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="record-reader-mapping" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="env" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PIPES">
<xs:sequence>
<xs:element name="map" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="reduce" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="inputformat" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="partitioner" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="writer" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="program" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PREPARE">
<xs:sequence>
<xs:element name="delete" type="workflow:DELETE" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="mkdir" type="workflow:MKDIR" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DELETE">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MKDIR">
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="MOVE">
<xs:attribute name="source" type="xs:string" use="required"/>
<xs:attribute name="target" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="CHMOD">
<xs:attribute name="path" type="xs:string" use="required" />
<xs:attribute name="permissions" type="xs:string" use="required" />
<xs:attribute name="dir-files" type="xs:string" />
</xs:complexType>
</xs:schema>
Appendix B, Workflow Examples
Fork and Join Example
The following workflow definition example executes 4 Map-Reduce jobs in 3 steps, 1 job, 2 jobs in parallel and 1 job.
The output of the jobs in the previous step are use as input for the next jobs.
Required workflow job parameters:
- resourcemanager : ResourceManager HOST:PORT
- namenode : NameNode HOST:PORT
- input : input directory
- output : output directory
<workflow-app name='example-forkjoinwf' xmlns="uri:oozie:workflow:1.0">
<start to='firstjob' />
<action name="firstjob">
<map-reduce>
<resource-manager>${resourcemanager}</resource-manager>
<name-node>${namenode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>org.apache.hadoop.example.IdMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>org.apache.hadoop.example.IdReducer</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>${input}</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/usr/foo/${wf:id()}/temp1</value>
</property>
</configuration>
</map-reduce>
<ok to="fork" />
<error to="kill" />
</action>
<fork name='fork'>
<path start='secondjob' />
<path start='thirdjob' />
</fork>
<action name="secondjob">
<map-reduce>
<resource-manager>${resourcemanager}</resource-manager>
<name-node>${namenode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>org.apache.hadoop.example.IdMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>org.apache.hadoop.example.IdReducer</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>/usr/foo/${wf:id()}/temp1</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/usr/foo/${wf:id()}/temp2</value>
</property>
</configuration>
</map-reduce>
<ok to="join" />
<error to="kill" />
</action>
<action name="thirdjob">
<map-reduce>
<resource-manager>${resourcemanager}</resource-manager>
<name-node>${namenode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>org.apache.hadoop.example.IdMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>org.apache.hadoop.example.IdReducer</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>/usr/foo/${wf:id()}/temp1</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/usr/foo/${wf:id()}/temp3</value>
</property>
</configuration>
</map-reduce>
<ok to="join" />
<error to="kill" />
</action>
<join name='join' to='finalejob'/>
<action name="finaljob">
<map-reduce>
<resource-manager>${resourcemanager}</resource-manager>
<name-node>${namenode}</name-node>
<configuration>
<property>
<name>mapred.mapper.class</name>
<value>org.apache.hadoop.example.IdMapper</value>
</property>
<property>
<name>mapred.reducer.class</name>
<value>org.apache.hadoop.example.IdReducer</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>/usr/foo/${wf:id()}/temp2,/usr/foo/${wf:id()}/temp3
</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>${output}</value>
</property>
</configuration>
</map-reduce>
<ok to="end" />
<ok to="kill" />
</action>
<kill name="kill">
<message>Map/Reduce failed, error message[${wf:errorMessage()}]</message>
</kill>
<end name='end'/>
</workflow-app>