Package org.apache.hadoop.fs.statistics

Class DurationStatisticSummary

java.lang.Object

org.apache.hadoop.fs.statistics.DurationStatisticSummary

All Implemented Interfaces:

Serializable

@Public
@Unstable
public final class DurationStatisticSummary
extends Object
implements Serializable

Summary of duration tracking statistics as extracted from an IOStatistics instance.

This is for reporting and testing.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
DurationStatisticSummary(String key, boolean success, long count, long max, long min, MeanStatistic mean)	Constructor.

Method Summary

Modifier and Type	Method	Description
static DurationStatisticSummary	fetchDurationSummary(IOStatistics source, String key, boolean success)	Fetch the duration timing summary of success or failure operations from an IO Statistics source.
static DurationStatisticSummary	fetchSuccessSummary(IOStatistics source, String key)	Fetch the duration timing summary from an IOStatistics source.
long	getCount()
String	getKey()
long	getMax()
MeanStatistic	getMean()
long	getMin()
boolean	isSuccess()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

DurationStatisticSummary

public DurationStatisticSummary(String key,
 boolean success,
 long count,
 long max,
 long min,
 @Nullable
 MeanStatistic mean)

Constructor.

Parameters:

key - Statistic key.

success - Are these success or failure statistics.

count - Count of operation invocations.

max - Max duration; -1 if unknown.

min - Min duration; -1 if unknown.

mean - Mean duration -may be null. (will be cloned)

Method Details

getKey

public String getKey()

isSuccess

public boolean isSuccess()

getCount

public long getCount()

getMax

public long getMax()

getMin

public long getMin()

getMean

public MeanStatistic getMean()

toString

public String toString()

Overrides:

toString in class Object

fetchDurationSummary

public static DurationStatisticSummary fetchDurationSummary(IOStatistics source,
 String key,
 boolean success)

Fetch the duration timing summary of success or failure operations from an IO Statistics source. If the duration key is unknown, the summary will be incomplete.

Parameters:

source - source of data

key - duration statistic key

success - fetch success statistics, or if false, failure stats.

Returns:

a summary of the statistics.

fetchSuccessSummary

public static DurationStatisticSummary fetchSuccessSummary(IOStatistics source,
 String key)

Fetch the duration timing summary from an IOStatistics source. If the duration key is unknown, the summary will be incomplete.

Parameters:

source - source of data

key - duration statistic key

Returns:

a summary of the statistics.