org.apache.hadoop.hbase.regionserver.snapshot

Class FlushSnapshotSubprocedure

java.lang.Object

org.apache.hadoop.hbase.procedure.Subprocedure

org.apache.hadoop.hbase.regionserver.snapshot.FlushSnapshotSubprocedure

All Implemented Interfaces:

Callable<Void>

@InterfaceAudience.Private
 @InterfaceStability.Unstable
public class FlushSnapshotSubprocedure
extends Subprocedure

This online snapshot implementation uses the distributed procedure framework to force a store flush and then records the hfiles. Its enter stage does nothing. Its leave stage then flushes the memstore, builds the region server's snapshot manifest from its hfiles list, and copies .regioninfos into the snapshot working directory. At the master side, there is an atomic rename of the working dir into the proper snapshot directory.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FlushSnapshotSubprocedure.RegionSnapshotTask Callable for adding files to snapshot manifest working dir.

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.procedure.Subprocedure

Subprocedure.SubprocedureImpl

Field Summary

Fields inherited from class org.apache.hadoop.hbase.procedure.Subprocedure

executionTimeoutTimer, monitor, rpcs, wakeFrequency

Constructor Summary

Constructors

Constructor and Description
FlushSnapshotSubprocedure(ProcedureMember member, ForeignExceptionDispatcher errorListener, long wakeFrequency, long timeout, List<HRegion> regions, SnapshotProtos.SnapshotDescription snapshot, org.apache.hadoop.hbase.regionserver.snapshot.RegionServerSnapshotManager.SnapshotSubprocedurePool taskManager)

Method Summary

Modifier and Type	Method and Description
void	acquireBarrier() do nothing, core of snapshot is executed in insideBarrier() step.
void	cleanup(Exception e) Cancel threads if they haven't finished.
byte[]	insideBarrier() do a flush snapshot of every region on this rs from the target table.
void	releaseBarrier() Hooray!

Methods inherited from class org.apache.hadoop.hbase.procedure.Subprocedure

call, cancel, getMemberName, getName, receiveReachedGlobalBarrier, waitForLocallyCompleted

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FlushSnapshotSubprocedure

public FlushSnapshotSubprocedure(ProcedureMember member,
                                 ForeignExceptionDispatcher errorListener,
                                 long wakeFrequency,
                                 long timeout,
                                 List<HRegion> regions,
                                 SnapshotProtos.SnapshotDescription snapshot,
                                 org.apache.hadoop.hbase.regionserver.snapshot.RegionServerSnapshotManager.SnapshotSubprocedurePool taskManager)

Method Detail

acquireBarrier

public void acquireBarrier()
                    throws ForeignException

do nothing, core of snapshot is executed in insideBarrier() step.

Specified by:

acquireBarrier in class Subprocedure

Throws:

ForeignException

insideBarrier

public byte[] insideBarrier()
                     throws ForeignException

do a flush snapshot of every region on this rs from the target table.

Specified by:

insideBarrier in class Subprocedure

Returns:

the data the subprocedure wants to return to coordinator side.

Throws:

ForeignException

cleanup

public void cleanup(Exception e)

Cancel threads if they haven't finished.

Specified by:

cleanup in class Subprocedure

releaseBarrier

public void releaseBarrier()

Hooray!