org.apache.hadoop.hbase.client

Interface RequestController

@InterfaceAudience.Public
public interface RequestController

An interface for client request scheduling algorithm.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	RequestController.Checker Picks up the valid data.
static class	RequestController.ReturnCode

Method Summary

Modifier and Type	Method and Description
void	decTaskCounters(Collection<byte[]> regions, ServerName sn) Decrement the counter if a task is accomplished.
long	getNumberOfTasksInProgress()
void	incTaskCounters(Collection<byte[]> regions, ServerName sn) Increment the counter if we build a valid task.
RequestController.Checker	newChecker()
void	waitForFreeSlot(long id, int periodToTrigger, Consumer<Long> trigger) Wait until there is at least one slot for a new task.
void	waitForMaximumCurrentTasks(long max, long id, int periodToTrigger, Consumer<Long> trigger) Waits for the running tasks to complete.

Method Detail

newChecker

RequestController.Checker newChecker()

Returns:

A new checker for evaluating a batch rows.

incTaskCounters

void incTaskCounters(Collection<byte[]> regions,
                     ServerName sn)

Increment the counter if we build a valid task.

Parameters:

regions - The destination of task

sn - The target server

decTaskCounters

void decTaskCounters(Collection<byte[]> regions,
                     ServerName sn)

Decrement the counter if a task is accomplished.

Parameters:

regions - The destination of task

sn - The target server

getNumberOfTasksInProgress

long getNumberOfTasksInProgress()

Returns:

The number of running task.

waitForMaximumCurrentTasks

void waitForMaximumCurrentTasks(long max,
                                long id,
                                int periodToTrigger,
                                Consumer<Long> trigger)
                         throws InterruptedIOException

Waits for the running tasks to complete. If there are specified threshold and trigger, the implementation should wake up once in a while for checking the threshold and calling trigger.

Parameters:

max - This method will return if the number of running tasks is less than or equal to max.

id - the caller's id

periodToTrigger - The period to invoke the trigger. This value is a hint. The real period depends on the implementation.

trigger - The object to call periodically.

Throws:

InterruptedIOException - If the waiting is interrupted

waitForFreeSlot

void waitForFreeSlot(long id,
                     int periodToTrigger,
                     Consumer<Long> trigger)
              throws InterruptedIOException

Wait until there is at least one slot for a new task.

Parameters:

id - the caller's id

periodToTrigger - The period to invoke the trigger. This value is a hint. The real period depends on the implementation.

trigger - The object to call periodically.

Throws:

InterruptedIOException - If the waiting is interrupted