org.apache.hadoop.hbase.coprocessor

Class BaseWALObserver

java.lang.Object

org.apache.hadoop.hbase.coprocessor.BaseWALObserver

All Implemented Interfaces:

Coprocessor, WALObserver

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

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

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
BaseWALObserver()

Method Summary

Methods

Modifier and Type	Method and Description
void	postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) Called after a WALEdit is writen to WAL.
boolean	preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) Called before a WALEdit is writen to WAL.
void	start(CoprocessorEnvironment e)
void	stop(CoprocessorEnvironment e)

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseWALObserver

public BaseWALObserver()

Method Detail

start

public void start(CoprocessorEnvironment e)
           throws IOException

Specified by:

start in interface Coprocessor

Throws:

IOException

stop

public void stop(CoprocessorEnvironment e)
          throws IOException

Specified by:

stop in interface Coprocessor

Throws:

IOException

preWALWrite

public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx,
                  HRegionInfo info,
                  HLogKey logKey,
                  WALEdit logEdit)
                    throws IOException

Description copied from interface: WALObserver

Called before a WALEdit is writen to WAL.

Specified by:

preWALWrite in interface WALObserver

Returns:

true if default behavior should be bypassed, false otherwise

Throws:

IOException

postWALWrite

public void postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx,
                HRegionInfo info,
                HLogKey logKey,
                WALEdit logEdit)
                  throws IOException

Description copied from interface: WALObserver

Called after a WALEdit is writen to WAL.

Specified by:

postWALWrite in interface WALObserver

Throws:

IOException