org.apache.hadoop.hbase.coprocessor.example

Class ZooKeeperScanPolicyObserver

java.lang.Object

org.apache.hadoop.hbase.coprocessor.example.ZooKeeperScanPolicyObserver

All Implemented Interfaces:

Coprocessor, RegionCoprocessor, RegionObserver

@InterfaceAudience.Private
public class ZooKeeperScanPolicyObserver
extends Object
implements RegionCoprocessor, RegionObserver

This is an example showing how a RegionObserver could configured via ZooKeeper in order to control a Region compaction, flush, and scan policy. This also demonstrated the use of shared RegionObserver state. See RegionCoprocessorEnvironment.getSharedData().

This would be useful for an incremental backup tool, which would indicate the last time of a successful backup via ZK and instruct HBase that to safely delete the data which has already been backup.

Nested Class Summary

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

Coprocessor.State

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

RegionObserver.MutationType

Field Summary

Fields

Modifier and Type	Field and Description
static String	NODE
static String	ZK_ENSEMBLE_KEY
static int	ZK_SESSION_TIMEOUT_DEFAULT
static String	ZK_SESSION_TIMEOUT_KEY

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

PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

Constructor Summary

Constructors

Constructor and Description
ZooKeeperScanPolicyObserver()

Method Summary

Modifier and Type	Method and Description
Optional<RegionObserver>	getRegionObserver()
void	preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, ScanType scanType, ScanOptions options, CompactionLifeCycleTracker tracker, CompactionRequest request)
void	preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, ScanOptions options, FlushLifeCycleTracker tracker)
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

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

getBulkLoadObserver, getEndpointObserver

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

getServices

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, preCompact, preCompactSelection, preDelete, preExists, preFlush, preFlush, preGetOp, preIncrement, preIncrementAfterRowLock, preMemStoreCompaction, preMemStoreCompactionCompact, preMemStoreCompactionCompactScannerOpen, preOpen, prePrepareTimeStampForDeleteVersion, prePut, preReplayWALs, preScannerClose, preScannerNext, preScannerOpen, preStoreFileReaderOpen, preStoreScannerOpen, preWALRestore

Field Detail

ZK_ENSEMBLE_KEY

public static final String ZK_ENSEMBLE_KEY

See Also:

Constant Field Values

ZK_SESSION_TIMEOUT_KEY

public static final String ZK_SESSION_TIMEOUT_KEY

See Also:

Constant Field Values

ZK_SESSION_TIMEOUT_DEFAULT

public static final int ZK_SESSION_TIMEOUT_DEFAULT

See Also:

Constant Field Values

NODE

public static final String NODE

See Also:

Constant Field Values

Constructor Detail

ZooKeeperScanPolicyObserver

public ZooKeeperScanPolicyObserver()

Method Detail

getRegionObserver

public Optional<RegionObserver> getRegionObserver()

Specified by:

getRegionObserver in interface RegionCoprocessor

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

preFlushScannerOpen

public void preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                Store store,
                                ScanOptions options,
                                FlushLifeCycleTracker tracker)
                         throws IOException

Specified by:

preFlushScannerOpen in interface RegionObserver

Throws:

IOException

preCompactScannerOpen

public void preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                  Store store,
                                  ScanType scanType,
                                  ScanOptions options,
                                  CompactionLifeCycleTracker tracker,
                                  CompactionRequest request)
                           throws IOException

Specified by:

preCompactScannerOpen in interface RegionObserver

Throws:

IOException