org.apache.hadoop.metrics2.lib

Class MutableHistogram

java.lang.Object

MutableMetric

org.apache.hadoop.metrics2.lib.MutableHistogram

All Implemented Interfaces:

MetricHistogram

Direct Known Subclasses:

MutableRangeHistogram

@InterfaceAudience.Private
public class MutableHistogram
extends MutableMetric
implements MetricHistogram

A histogram implementation that runs in constant space, and exports to hadoop2's metrics2 system.

Field Summary

Fields

Modifier and Type	Field and Description
protected Counter	counter
protected String	desc
protected FastLongHistogram	histogram
protected String	name

Fields inherited from interface org.apache.hadoop.metrics2.MetricHistogram

MAX_METRIC_NAME, MEAN_METRIC_NAME, MEDIAN_METRIC_NAME, MIN_METRIC_NAME, NINETIETH_PERCENTILE_METRIC_NAME, NINETY_EIGHTH_PERCENTILE_METRIC_NAME, NINETY_FIFTH_PERCENTILE_METRIC_NAME, NINETY_NINE_POINT_NINETH_PERCENTILE_METRIC_NAME, NINETY_NINETH_PERCENTILE_METRIC_NAME, NUM_OPS_METRIC_NAME, SEVENTY_FIFTH_PERCENTILE_METRIC_NAME, TWENTY_FIFTH_PERCENTILE_METRIC_NAME

Constructor Summary

Constructors

Modifier	Constructor and Description
	MutableHistogram(MetricsInfo info)
	MutableHistogram(String name, String description)
protected	MutableHistogram(String name, String description, long maxExpected)

Method Summary

Modifier and Type	Method and Description
void	add(long val) Add a single value to a histogram's stream of values.
void	snapshot(MetricsRecordBuilder metricsRecordBuilder, boolean all)
protected void	updateSnapshotMetrics(MetricsRecordBuilder metricsRecordBuilder, FastLongHistogram histo)

Methods inherited from class java.lang.Object

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

Field Detail

histogram

protected final FastLongHistogram histogram

name

protected final String name

desc

protected final String desc

counter

protected final Counter counter

Constructor Detail

MutableHistogram

public MutableHistogram(MetricsInfo info)

MutableHistogram

public MutableHistogram(String name,
                        String description)

MutableHistogram

protected MutableHistogram(String name,
                           String description,
                           long maxExpected)

Method Detail

add

public void add(long val)

Description copied from interface: MetricHistogram

Add a single value to a histogram's stream of values.

Specified by:

add in interface MetricHistogram

snapshot

public void snapshot(MetricsRecordBuilder metricsRecordBuilder,
                     boolean all)

updateSnapshotMetrics

protected void updateSnapshotMetrics(MetricsRecordBuilder metricsRecordBuilder,
                                     FastLongHistogram histo)