org.apache.hadoop.hbase.coprocessor

Class BaseRegionServerObserver

java.lang.Object

org.apache.hadoop.hbase.coprocessor.BaseRegionServerObserver

All Implemented Interfaces:

Coprocessor, RegionServerObserver

@InterfaceAudience.LimitedPrivate(value="Coprocesssor")
@InterfaceStability.Evolving
public class BaseRegionServerObserver
extends Object
implements RegionServerObserver

An abstract class that implements RegionServerObserver. By extending it, you can create your own region server observer without overriding all abstract methods of RegionServerObserver.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor

Coprocessor.State

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.Coprocessor

PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

Constructor Summary

Constructors

Constructor and Description
BaseRegionServerObserver()

Method Summary

Methods

Modifier and Type	Method and Description
void	postMerge(ObserverContext<RegionServerCoprocessorEnvironment> c, HRegion regionA, HRegion regionB, HRegion mergedRegion) called after the regions merge.
void	postMergeCommit(ObserverContext<RegionServerCoprocessorEnvironment> ctx, HRegion regionA, HRegion regionB, HRegion mergedRegion) This will be called after PONR step as part of regions merge transaction.
void	postRollBackMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx, HRegion regionA, HRegion regionB) This will be called after the roll back of the regions merge.
void	postRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx) This will be called after executing user request to roll a region server WAL.
void	preMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx, HRegion regionA, HRegion regionB) Called before the regions merge.
void	preMergeCommit(ObserverContext<RegionServerCoprocessorEnvironment> ctx, HRegion regionA, HRegion regionB, List<Mutation> metaEntries) This will be called before PONR step as part of regions merge transaction.
void	preRollBackMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx, HRegion regionA, HRegion regionB) This will be called before the roll back of the regions merge.
void	preRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx) This will be called before executing user request to roll a region server WAL.
void	preStopRegionServer(ObserverContext<RegionServerCoprocessorEnvironment> env) Called before stopping region server.
void	start(CoprocessorEnvironment env)
void	stop(CoprocessorEnvironment env)

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseRegionServerObserver

public BaseRegionServerObserver()

Method Detail

preStopRegionServer

public void preStopRegionServer(ObserverContext<RegionServerCoprocessorEnvironment> env)
                         throws IOException

Description copied from interface: RegionServerObserver

Called before stopping region server.

Specified by:

preStopRegionServer in interface RegionServerObserver

Parameters:

env - An instance of RegionServerCoprocessorEnvironment

Throws:

IOException - Signals that an I/O exception has occurred.

start

public void start(CoprocessorEnvironment env)
           throws IOException

Specified by:

start in interface Coprocessor

Throws:

IOException

stop

public void stop(CoprocessorEnvironment env)
          throws IOException

Specified by:

stop in interface Coprocessor

Throws:

IOException

preMerge

public void preMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx,
            HRegion regionA,
            HRegion regionB)
              throws IOException

Description copied from interface: RegionServerObserver

Called before the regions merge. Call ObserverContext.bypass() to skip the merge.

Specified by:

preMerge in interface RegionServerObserver

Throws:

IOException - if an error occurred on the coprocessor

postMerge

public void postMerge(ObserverContext<RegionServerCoprocessorEnvironment> c,
             HRegion regionA,
             HRegion regionB,
             HRegion mergedRegion)
               throws IOException

Description copied from interface: RegionServerObserver

called after the regions merge.

Specified by:

postMerge in interface RegionServerObserver

Throws:

IOException

preMergeCommit

public void preMergeCommit(ObserverContext<RegionServerCoprocessorEnvironment> ctx,
                  HRegion regionA,
                  HRegion regionB,
                  List<Mutation> metaEntries)
                    throws IOException

Description copied from interface: RegionServerObserver

This will be called before PONR step as part of regions merge transaction. Calling ObserverContext.bypass() rollback the merge

Specified by:

preMergeCommit in interface RegionServerObserver

metaEntries - mutations to execute on hbase:meta atomically with regions merge updates. Any puts or deletes to execute on hbase:meta can be added to the mutations.

Throws:

IOException

postMergeCommit

public void postMergeCommit(ObserverContext<RegionServerCoprocessorEnvironment> ctx,
                   HRegion regionA,
                   HRegion regionB,
                   HRegion mergedRegion)
                     throws IOException

Description copied from interface: RegionServerObserver

This will be called after PONR step as part of regions merge transaction.

Specified by:

postMergeCommit in interface RegionServerObserver

Throws:

IOException

preRollBackMerge

public void preRollBackMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx,
                    HRegion regionA,
                    HRegion regionB)
                      throws IOException

Description copied from interface: RegionServerObserver

This will be called before the roll back of the regions merge.

Specified by:

preRollBackMerge in interface RegionServerObserver

Throws:

IOException

postRollBackMerge

public void postRollBackMerge(ObserverContext<RegionServerCoprocessorEnvironment> ctx,
                     HRegion regionA,
                     HRegion regionB)
                       throws IOException

Description copied from interface: RegionServerObserver

This will be called after the roll back of the regions merge.

Specified by:

postRollBackMerge in interface RegionServerObserver

Throws:

IOException

preRollWALWriterRequest

public void preRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx)
                             throws IOException

Description copied from interface: RegionServerObserver

This will be called before executing user request to roll a region server WAL.

Specified by:

preRollWALWriterRequest in interface RegionServerObserver

Parameters:

ctx - An instance of ObserverContext

Throws:

IOException - Signals that an I/O exception has occurred.

postRollWALWriterRequest

public void postRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx)
                              throws IOException

Description copied from interface: RegionServerObserver

This will be called after executing user request to roll a region server WAL.

Specified by:

postRollWALWriterRequest in interface RegionServerObserver

Parameters:

ctx - An instance of ObserverContext

Throws:

IOException - Signals that an I/O exception has occurred.