org.apache.hadoop.hbase.coprocessor.example

Class WriteHeavyIncrementObserver

java.lang.Object

org.apache.hadoop.hbase.coprocessor.example.WriteHeavyIncrementObserver

All Implemented Interfaces:

org.apache.hadoop.hbase.Coprocessor, org.apache.hadoop.hbase.coprocessor.RegionCoprocessor, org.apache.hadoop.hbase.coprocessor.RegionObserver

@InterfaceAudience.Private
public class WriteHeavyIncrementObserver
extends Object
implements org.apache.hadoop.hbase.coprocessor.RegionCoprocessor, org.apache.hadoop.hbase.coprocessor.RegionObserver

An example for implementing a counter that reads is much less than writes, i.e, write heavy.

We will convert increment to put, and do aggregating when get. And of course the return value of increment is useless then.

Notice that this is only an example so we do not handle most corner cases, for example, you must provide a qualifier when doing a get.

Nested Class Summary

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

org.apache.hadoop.hbase.Coprocessor.State

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

org.apache.hadoop.hbase.coprocessor.RegionObserver.MutationType

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
WriteHeavyIncrementObserver()

Method Summary

Modifier and Type	Method and Description
Optional<org.apache.hadoop.hbase.coprocessor.RegionObserver>	getRegionObserver()
org.apache.hadoop.hbase.regionserver.InternalScanner	preCompact(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.InternalScanner scanner, org.apache.hadoop.hbase.regionserver.ScanType scanType, org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker tracker, org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest request)
void	preCompactScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.ScanType scanType, org.apache.hadoop.hbase.regionserver.ScanOptions options, org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker tracker, org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest request)
org.apache.hadoop.hbase.regionserver.InternalScanner	preFlush(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.InternalScanner scanner, org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker tracker)
void	preFlushScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.ScanOptions options, org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker tracker)
void	preGetOp(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.client.Get get, List<org.apache.hadoop.hbase.Cell> result)
org.apache.hadoop.hbase.client.Result	preIncrement(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.client.Increment increment)
org.apache.hadoop.hbase.regionserver.InternalScanner	preMemStoreCompactionCompact(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.InternalScanner scanner)
void	preMemStoreCompactionCompactScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.ScanOptions options)
void	preStoreScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.regionserver.Store store, org.apache.hadoop.hbase.regionserver.ScanOptions options)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.coprocessor.RegionCoprocessor

getBulkLoadObserver, getEndpointObserver

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

getServices, start, stop

Methods inherited from interface org.apache.hadoop.hbase.coprocessor.RegionObserver

postAppend, postBatchMutate, postBatchMutateIndispensably, postBulkLoadHFile, postCheckAndDelete, postCheckAndPut, postClose, postCloseRegionOperation, postCommitStoreFile, postCompact, postCompactSelection, postDelete, postExists, postFlush, postFlush, postGetOp, postIncrement, postInstantiateDeleteTracker, postMemStoreCompaction, postMutationBeforeWAL, postOpen, postPut, postReplayWALs, postScannerClose, postScannerFilterRow, postScannerNext, postScannerOpen, postStartRegionOperation, postStoreFileReaderOpen, postWALRestore, preAppend, preAppendAfterRowLock, preBatchMutate, preBulkLoadHFile, preCheckAndDelete, preCheckAndDeleteAfterRowLock, preCheckAndPut, preCheckAndPutAfterRowLock, preClose, preCommitStoreFile, preCompactSelection, preDelete, preExists, preFlush, preIncrementAfterRowLock, preMemStoreCompaction, preOpen, prePrepareTimeStampForDeleteVersion, prePut, preReplayWALs, preScannerClose, preScannerNext, preScannerOpen, preStoreFileReaderOpen, preWALRestore

Constructor Detail

WriteHeavyIncrementObserver

public WriteHeavyIncrementObserver()

Method Detail

getRegionObserver

public Optional<org.apache.hadoop.hbase.coprocessor.RegionObserver> getRegionObserver()

Specified by:

getRegionObserver in interface org.apache.hadoop.hbase.coprocessor.RegionCoprocessor

preFlushScannerOpen

public void preFlushScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                org.apache.hadoop.hbase.regionserver.Store store,
                                org.apache.hadoop.hbase.regionserver.ScanOptions options,
                                org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker tracker)
                         throws IOException

Specified by:

preFlushScannerOpen in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preFlush

public org.apache.hadoop.hbase.regionserver.InternalScanner preFlush(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                                                     org.apache.hadoop.hbase.regionserver.Store store,
                                                                     org.apache.hadoop.hbase.regionserver.InternalScanner scanner,
                                                                     org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker tracker)
                                                              throws IOException

Specified by:

preFlush in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preCompactScannerOpen

public void preCompactScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                  org.apache.hadoop.hbase.regionserver.Store store,
                                  org.apache.hadoop.hbase.regionserver.ScanType scanType,
                                  org.apache.hadoop.hbase.regionserver.ScanOptions options,
                                  org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker tracker,
                                  org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest request)
                           throws IOException

Specified by:

preCompactScannerOpen in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preCompact

public org.apache.hadoop.hbase.regionserver.InternalScanner preCompact(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                                                       org.apache.hadoop.hbase.regionserver.Store store,
                                                                       org.apache.hadoop.hbase.regionserver.InternalScanner scanner,
                                                                       org.apache.hadoop.hbase.regionserver.ScanType scanType,
                                                                       org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker tracker,
                                                                       org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest request)
                                                                throws IOException

Specified by:

preCompact in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preMemStoreCompactionCompactScannerOpen

public void preMemStoreCompactionCompactScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                                    org.apache.hadoop.hbase.regionserver.Store store,
                                                    org.apache.hadoop.hbase.regionserver.ScanOptions options)
                                             throws IOException

Specified by:

preMemStoreCompactionCompactScannerOpen in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preMemStoreCompactionCompact

public org.apache.hadoop.hbase.regionserver.InternalScanner preMemStoreCompactionCompact(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                                                                         org.apache.hadoop.hbase.regionserver.Store store,
                                                                                         org.apache.hadoop.hbase.regionserver.InternalScanner scanner)
                                                                                  throws IOException

Specified by:

preMemStoreCompactionCompact in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preGetOp

public void preGetOp(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                     org.apache.hadoop.hbase.client.Get get,
                     List<org.apache.hadoop.hbase.Cell> result)
              throws IOException

Specified by:

preGetOp in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preIncrement

public org.apache.hadoop.hbase.client.Result preIncrement(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> c,
                                                          org.apache.hadoop.hbase.client.Increment increment)
                                                   throws IOException

Specified by:

preIncrement in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException

preStoreScannerOpen

public void preStoreScannerOpen(org.apache.hadoop.hbase.coprocessor.ObserverContext<org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment> ctx,
                                org.apache.hadoop.hbase.regionserver.Store store,
                                org.apache.hadoop.hbase.regionserver.ScanOptions options)
                         throws IOException

Specified by:

preStoreScannerOpen in interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Throws:

IOException