Package org.apache.hadoop.hbase.regionserver.wal

Class MetricsWAL

java.lang.Object

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

All Implemented Interfaces:

WALActionsListener

@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.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.regionserver.wal.WALActionsListener

WALActionsListener.RollRequestReason

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.slf4j.Logger	LOG
private final MetricsWALSource	source

Constructor Summary

Constructors

Constructor	Description
MetricsWAL()
MetricsWAL(MetricsWALSource s)

Method Summary

Modifier and Type	Method	Description
void	logRollRequested(WALActionsListener.RollRequestReason reason)	A request was made that the WAL be rolled.
void	postAppend(long size, long time, WALKey logkey, WALEdit logEdit)	For notification post append to the writer.
void	postLogRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath)	The WAL has been rolled.
void	postSync(long timeInNanos, int handlerSyncs)	For notification post writer sync.

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.regionserver.wal.WALActionsListener

logCloseRequested, postLogArchive, preLogArchive, preLogRoll, visitLogEntryBeforeWrite

Field Details

LOG

private static final org.slf4j.Logger LOG

source

private final MetricsWALSource source

Constructor Details

MetricsWAL

public MetricsWAL()

MetricsWAL

MetricsWAL(MetricsWALSource s)

Method Details

postSync

public void postSync(long timeInNanos,
 int handlerSyncs)

Description copied from interface: WALActionsListener

For notification post writer sync. Used by metrics system at least.

Specified by:

postSync in interface WALActionsListener

Parameters:

timeInNanos - How long the filesystem sync took in nanoseconds.

handlerSyncs - How many sync handler calls were released by this call to filesystem sync.

postAppend

public void postAppend(long size,
 long time,
 WALKey logkey,
 WALEdit logEdit)
                throws IOException

Description copied from interface: WALActionsListener

For notification post append to the writer. Used by metrics system at least. TODO: Combine this with above.

Specified by:

postAppend in interface WALActionsListener

Parameters:

size - approx length of cells in this append.

time - elapsed time in milliseconds.

logkey - A WAL key

logEdit - A WAL edit containing list of cells.

Throws:

IOException - if any network or I/O error occurred

logRollRequested

public void logRollRequested(WALActionsListener.RollRequestReason reason)

Description copied from interface: WALActionsListener

A request was made that the WAL be rolled.

Specified by:

logRollRequested in interface WALActionsListener

postLogRoll

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

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 wal

newPath - the path to the new wal