org.apache.hadoop.hbase.procedure

Class Subprocedure.SubprocedureImpl

java.lang.Object

org.apache.hadoop.hbase.procedure.Subprocedure

org.apache.hadoop.hbase.procedure.Subprocedure.SubprocedureImpl

All Implemented Interfaces:

Callable<Void>

Enclosing class:

Subprocedure

public static class Subprocedure.SubprocedureImpl
extends Subprocedure

Empty Subprocedure for testing. Must be public for stubbing used in testing to work.

Nested Class Summary

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
SubprocedureImpl(ProcedureMember member, String opName, ForeignExceptionDispatcher monitor, long wakeFrequency, long timeout)

Method Summary

Modifier and Type	Method and Description
void	acquireBarrier() The implementation of this method should gather and hold required resources (locks, disk space, etc) to satisfy the Procedures barrier condition.
void	cleanup(Exception e) Users should override this method.
byte[]	insideBarrier() The implementation of this method should act with the assumption that the barrier condition has been satisfied.

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

SubprocedureImpl

public SubprocedureImpl(ProcedureMember member,
                        String opName,
                        ForeignExceptionDispatcher monitor,
                        long wakeFrequency,
                        long timeout)

Method Detail

acquireBarrier

public void acquireBarrier()
                    throws ForeignException

Description copied from class: Subprocedure

The implementation of this method should gather and hold required resources (locks, disk space, etc) to satisfy the Procedures barrier condition. For example, this would be where to make all the regions on a RS on the quiescent for an procedure that required all regions to be globally quiesed. Users should override this method. If a quiescent is not required, this is overkill but can still be used to execute a procedure on all members and to propagate any exceptions.

Specified by:

acquireBarrier in class Subprocedure

Throws:

ForeignException

insideBarrier

public byte[] insideBarrier()
                     throws ForeignException

Description copied from class: Subprocedure

The implementation of this method should act with the assumption that the barrier condition has been satisfied. Continuing the previous example, a condition could be that all RS's globally have been quiesced, and procedures that require this precondition could be implemented here. The implementation should also collect the result of the subprocedure as data to be returned to the coordinator upon successful completion. Users should override this method.

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)

Description copied from class: Subprocedure

Users should override this method. This implementation of this method should rollback and cleanup any temporary or partially completed state that the Subprocedure.acquireBarrier() may have created.

Specified by:

cleanup in class Subprocedure