org.apache.hadoop.hbase.coprocessor

Interface RegionServerObserver

All Superinterfaces:

Coprocessor

All Known Implementing Classes:

AccessController, BaseRegionServerObserver

public interface RegionServerObserver
extends Coprocessor

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

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.

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

start, stop

Method Detail

preStopRegionServer

void preStopRegionServer(ObserverContext<RegionServerCoprocessorEnvironment> env)
                         throws IOException

Called before stopping region server.

Parameters:

env - An instance of RegionServerCoprocessorEnvironment

Throws:

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

preMerge

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

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

Parameters:

ctx -

regionA -

regionB -

Throws:

IOException - if an error occurred on the coprocessor

IOException

postMerge

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

called after the regions merge.

Parameters:

c -

regionA -

regionB -

mergedRegion -

Throws:

IOException

preMergeCommit

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

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

Parameters:

ctx -

regionA -

regionB -

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

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

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

Parameters:

ctx -

regionA -

regionB -

mergedRegion -

Throws:

IOException

preRollBackMerge

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

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

Parameters:

ctx -

regionA -

regionB -

Throws:

IOException

postRollBackMerge

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

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

Parameters:

ctx -

regionA -

regionB -

Throws:

IOException

preRollWALWriterRequest

void preRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx)
                             throws IOException

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

Parameters:

ctx - An instance of ObserverContext

Throws:

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

postRollWALWriterRequest

void postRollWALWriterRequest(ObserverContext<RegionServerCoprocessorEnvironment> ctx)
                              throws IOException

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

Parameters:

ctx - An instance of ObserverContext

Throws:

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