org.apache.hadoop.hbase.regionserver.wal

Class MetricsWAL

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.MetricsWAL

All Implemented Interfaces:

WALActionsListener

@InterfaceAudience.Private
public class MetricsWAL
extends Object
implements WALActionsListener

Class used to push numbers about the WAL into the metrics subsystem. This will take a single function call and turn it into multiple manipulations of the hadoop metrics system.

Constructor Summary

Constructors

Constructor and Description
MetricsWAL()

Method Summary

Methods

Modifier and Type	Method and Description
void	finishAppend(long time, long size)
void	finishSync(long time)
void	logCloseRequested() The WAL is about to close.
void	logRollRequested(boolean underReplicated) A request was made that the WAL be rolled.
void	postLogArchive(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL has been archived.
void	postLogRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL has been rolled.
void	preLogArchive(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL is going to be archived.
void	preLogRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL is going to be rolled.
void	visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey, WALEdit logEdit) Called before each write.
void	visitLogEntryBeforeWrite(HTableDescriptor htd, HLogKey logKey, WALEdit logEdit)

Methods inherited from class java.lang.Object

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

Constructor Detail

MetricsWAL

public MetricsWAL()

Method Detail

finishSync

public void finishSync(long time)

finishAppend

public void finishAppend(long time,
                long size)

logRollRequested

public void logRollRequested(boolean underReplicated)

Description copied from interface: WALActionsListener

A request was made that the WAL be rolled.

Specified by:

logRollRequested in interface WALActionsListener

Parameters:

underReplicated - roll requested because of too few replicas if true

preLogRoll

public void preLogRoll(org.apache.hadoop.fs.Path oldPath,
              org.apache.hadoop.fs.Path newPath)
                throws IOException

Description copied from interface: WALActionsListener

The WAL is going to be rolled. The oldPath can be null if this is the first log file from the regionserver.

Specified by:

preLogRoll in interface WALActionsListener

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

postLogRoll

public void postLogRoll(org.apache.hadoop.fs.Path oldPath,
               org.apache.hadoop.fs.Path newPath)
                 throws IOException

Description copied from interface: WALActionsListener

The WAL has been rolled. The oldPath can be null if this is the first log file from the regionserver.

Specified by:

postLogRoll in interface WALActionsListener

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

preLogArchive

public void preLogArchive(org.apache.hadoop.fs.Path oldPath,
                 org.apache.hadoop.fs.Path newPath)
                   throws IOException

Description copied from interface: WALActionsListener

The WAL is going to be archived.

Specified by:

preLogArchive in interface WALActionsListener

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

postLogArchive

public void postLogArchive(org.apache.hadoop.fs.Path oldPath,
                  org.apache.hadoop.fs.Path newPath)
                    throws IOException

Description copied from interface: WALActionsListener

The WAL has been archived.

Specified by:

postLogArchive in interface WALActionsListener

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

logCloseRequested

public void logCloseRequested()

Description copied from interface: WALActionsListener

The WAL is about to close.

Specified by:

logCloseRequested in interface WALActionsListener

visitLogEntryBeforeWrite

public void visitLogEntryBeforeWrite(HRegionInfo info,
                            HLogKey logKey,
                            WALEdit logEdit)

Description copied from interface: WALActionsListener

Called before each write.

Specified by:

visitLogEntryBeforeWrite in interface WALActionsListener

visitLogEntryBeforeWrite

public void visitLogEntryBeforeWrite(HTableDescriptor htd,
                            HLogKey logKey,
                            WALEdit logEdit)

Specified by:

visitLogEntryBeforeWrite in interface WALActionsListener