org.apache.hadoop.dfs
Class NameNodeMetrics

java.lang.Object
  org.apache.hadoop.dfs.NameNodeMetrics

All Implemented Interfaces:

Updater

public class NameNodeMetrics
extends Object
implements Updater

This class is for maintaining the various NameNode statistics and publishing them through the metrics interfaces. This also registers the JMX MBean for RPC.

This class has a number of metrics variables that are publicly accessible; these variables (objects) have methods to update their values; for example:

syncs.inc()

Field Summary

MetricsTimeVaryingRate	blockReport
MetricsIntValue	fsImageLoadTime
MetricsTimeVaryingInt	numAddBlockOps
MetricsIntValue	numBlocksCorrupted
MetricsTimeVaryingInt	numCreateFileOps
MetricsTimeVaryingInt	numDeleteFileOps
MetricsTimeVaryingInt	numFilesCreated
MetricsTimeVaryingInt	numFilesRenamed
MetricsTimeVaryingInt	numGetBlockLocations
MetricsTimeVaryingInt	numGetListingOps
MetricsIntValue	safeModeTime
MetricsTimeVaryingRate	syncs
MetricsTimeVaryingRate	transactions

Method Summary

void	doUpdates(MetricsContext unused) Since this object is a registered updater, this method will be called periodically, e.g.
void	resetAllMinMax()
void	shutdown()

Methods inherited from class java.lang.Object

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

Field Detail

numFilesCreated

public MetricsTimeVaryingInt numFilesCreated

numGetBlockLocations

public MetricsTimeVaryingInt numGetBlockLocations

numFilesRenamed

public MetricsTimeVaryingInt numFilesRenamed

numGetListingOps

public MetricsTimeVaryingInt numGetListingOps

numCreateFileOps

public MetricsTimeVaryingInt numCreateFileOps

numDeleteFileOps

public MetricsTimeVaryingInt numDeleteFileOps

numAddBlockOps

public MetricsTimeVaryingInt numAddBlockOps

transactions

public MetricsTimeVaryingRate transactions

syncs

public MetricsTimeVaryingRate syncs

blockReport

public MetricsTimeVaryingRate blockReport

safeModeTime

public MetricsIntValue safeModeTime

fsImageLoadTime

public MetricsIntValue fsImageLoadTime

numBlocksCorrupted

public MetricsIntValue numBlocksCorrupted

Method Detail

shutdown

public void shutdown()

doUpdates

public void doUpdates(MetricsContext unused)

Since this object is a registered updater, this method will be called periodically, e.g. every 5 seconds.

Specified by:

doUpdates in interface Updater

resetAllMinMax

public void resetAllMinMax()