Package org.apache.hadoop.fs

Class FileSystemStorageStatistics

java.lang.Object

org.apache.hadoop.fs.StorageStatistics

org.apache.hadoop.fs.FileSystemStorageStatistics

All Implemented Interfaces:

java.lang.Iterable<StorageStatistics.LongStatistic>

@Private
@Unstable
public class FileSystemStorageStatistics
extends StorageStatistics
implements java.lang.Iterable<StorageStatistics.LongStatistic>

A basic StorageStatistics instance which simply returns data from FileSystem#Statistics.

Nested Class Summary

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

StorageStatistics.CommonStatisticNames, StorageStatistics.LongStatistic

Method Summary

Modifier and Type	Method	Description
java.lang.Long	getLong(java.lang.String key)	Get the value of a statistic.
long	getLong(Statistic op)
java.util.Iterator<StorageStatistics.LongStatistic>	getLongStatistics()	Get an iterator over all the currently tracked long statistics.
java.lang.String	getScheme()
long	incrementCounter(Statistic op, long count)	Increment a specific counter.
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

Method Detail

incrementCounter

public long incrementCounter(Statistic op,
                             long count)

Increment a specific counter.

Parameters:

op - operation

count - increment value

Returns:

the new value

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.

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.

iterator

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

Specified by:

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

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.

getLong

public long getLong(Statistic op)

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