Package org.apache.hadoop.fs.statistics.impl

Class StorageStatisticsFromIOStatistics

java.lang.Object

org.apache.hadoop.fs.StorageStatistics

org.apache.hadoop.fs.statistics.impl.StorageStatisticsFromIOStatistics

All Implemented Interfaces:

java.lang.Iterable<StorageStatistics.LongStatistic>

public class StorageStatisticsFromIOStatistics
extends StorageStatistics
implements java.lang.Iterable<StorageStatistics.LongStatistic>

Returns all the counters of an IOStatistics instance as StorageStatistics. This is dynamic. The reset() is downgraded to a no-op.

Nested Class Summary

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

StorageStatistics.CommonStatisticNames, StorageStatistics.LongStatistic

Constructor Summary

Constructors

Constructor	Description
StorageStatisticsFromIOStatistics(java.lang.String name, java.lang.String scheme, IOStatistics ioStatistics)	Instantiate.

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()	Take a snapshot of the current counter values and return an iterator over them.
java.lang.String	getScheme()
boolean	isTracked(java.lang.String key)	Return true if a statistic is being tracked.
java.util.Iterator<StorageStatistics.LongStatistic>	iterator()
void	reset()	Reset all the statistic data.

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

getName

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

StorageStatisticsFromIOStatistics

public StorageStatisticsFromIOStatistics(java.lang.String name,
                                         java.lang.String scheme,
                                         IOStatistics ioStatistics)

Instantiate.

Parameters:

name - storage statistics name.

scheme - FS scheme; may be null.

ioStatistics - IOStatistics source.

Method Detail

iterator

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

Specified by:

iterator in interface java.lang.Iterable<StorageStatistics.LongStatistic>

getLongStatistics

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

Take a snapshot of the current counter values and return an iterator over them.

Specified by:

getLongStatistics in class StorageStatistics

Returns:

all the counter statistics.

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)

Description copied from class: StorageStatistics

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

getScheme

public java.lang.String getScheme()

Overrides:

getScheme in class StorageStatistics

Returns:

the associated file system scheme if this is scheme specific, else return null.