Package org.apache.hadoop.metrics2.lib

Class MutableHistogram

java.lang.Object

org.apache.hadoop.metrics2.lib.MutableMetric

org.apache.hadoop.metrics2.lib.MutableHistogram

All Implemented Interfaces:

MetricHistogram

Direct Known Subclasses:

MutableRangeHistogram

@Private
public class MutableHistogram
extends org.apache.hadoop.metrics2.lib.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	Description
protected final String	desc
protected HistogramImpl	histogram
protected final 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

Constructor	Description
MutableHistogram(String name, String description)
MutableHistogram(org.apache.hadoop.metrics2.MetricsInfo info)

Method Summary

Modifier and Type	Method	Description
void	add(long val)	Add a single value to a histogram's stream of values.
long	getCount()	Return the total number of values added to the histogram.
long	getMax()
static void	snapshot(String name, String desc, Histogram histogram, org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder, boolean all)
void	snapshot(org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder, boolean all)
protected static void	updateSnapshotMetrics(String name, String desc, Histogram histogram, Snapshot snapshot, org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder)

Methods inherited from class org.apache.hadoop.metrics2.lib.MutableMetric

changed, clearChanged, setChanged, snapshot

Methods inherited from class java.lang.Object

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

Field Details

histogram

protected HistogramImpl histogram

name

protected final String name

desc

protected final String desc

Constructor Details

MutableHistogram

public MutableHistogram(org.apache.hadoop.metrics2.MetricsInfo info)

MutableHistogram

public MutableHistogram(String name,
 String description)

Method Details

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

Parameters:

val - the value to add

getCount

public long getCount()

Description copied from interface: MetricHistogram

Return the total number of values added to the histogram.

Specified by:

getCount in interface MetricHistogram

Returns:

the total number of values.

getMax

public long getMax()

snapshot

public void snapshot(org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder,
 boolean all)

Specified by:

snapshot in class org.apache.hadoop.metrics2.lib.MutableMetric

snapshot

public static void snapshot(String name,
 String desc,
 Histogram histogram,
 org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder,
 boolean all)

updateSnapshotMetrics

protected static void updateSnapshotMetrics(String name,
 String desc,
 Histogram histogram,
 Snapshot snapshot,
 org.apache.hadoop.metrics2.MetricsRecordBuilder metricsRecordBuilder)