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.

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
MetricsWAL()
MetricsWAL(MetricsWALSource s)

Method Summary

Modifier and Type	Method and Description
void	logRollRequested(boolean underReplicated) 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	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, postLogRoll, preLogArchive, preLogRoll, visitLogEntryBeforeWrite, visitLogEntryBeforeWrite

Field Detail

LOG

private static final org.slf4j.Logger LOG

source

private final MetricsWALSource source

Constructor Detail

MetricsWAL

public MetricsWAL()

MetricsWAL

MetricsWAL(MetricsWALSource s)

Method Detail

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(boolean underReplicated)

Description copied from interface: WALActionsListener

A request was made that the WAL be rolled.

Specified by:

logRollRequested in interface WALActionsListener