Package org.apache.hadoop.fs

Class UnionStorageStatistics

java.lang.Object

org.apache.hadoop.fs.StorageStatistics

org.apache.hadoop.fs.UnionStorageStatistics

@Private
@Unstable
public class UnionStorageStatistics
extends StorageStatistics

A StorageStatistics instance which combines the outputs of several other StorageStatistics instances.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.fs.StorageStatistics

StorageStatistics.CommonStatisticNames, StorageStatistics.LongStatistic

Constructor Summary

Constructors

Constructor	Description
UnionStorageStatistics(java.lang.String name, StorageStatistics[] stats)

Method Summary

Modifier and Type	Method	Description
java.lang.Long	getLong(java.lang.String key)	Get the value of a statistic.
java.util.Iterator<StorageStatistics.LongStatistic>	getLongStatistics()	Get an iterator over all the currently tracked long statistics.
boolean	isTracked(java.lang.String key)	Return true if a statistic is being tracked.
void	reset()	Reset all the statistic data.

Methods inherited from class org.apache.hadoop.fs.StorageStatistics

getName, getScheme

Methods inherited from class java.lang.Object

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

Constructor Detail

UnionStorageStatistics

public UnionStorageStatistics(java.lang.String name,
                              StorageStatistics[] stats)

Method Detail

getLongStatistics

public java.util.Iterator<StorageStatistics.LongStatistic> getLongStatistics()

Description copied from class: StorageStatistics

Get an iterator over all the currently tracked long statistics. The values returned will depend on the type of FileSystem or FileContext object. The values do not necessarily reflect a snapshot in time.

Specified by:

getLongStatistics in class StorageStatistics

Returns:

LongStatistic Iterator.

getLong

public java.lang.Long getLong(java.lang.String key)

Description copied from class: StorageStatistics

Get the value of a statistic.

Specified by:

getLong in class StorageStatistics

Parameters:

key - key.

Returns:

null if the statistic is not being tracked or is not a long statistic. The value of the statistic, otherwise.

isTracked

public boolean isTracked(java.lang.String key)

Return true if a statistic is being tracked.

Specified by:

isTracked in class StorageStatistics

Parameters:

key - key.

Returns:

True only if the statistic is being tracked.

reset

public void reset()

Description copied from class: StorageStatistics

Reset all the statistic data.

Specified by:

reset in class StorageStatistics