org.apache.hadoop.hbase.metrics.impl

Class HistogramImpl

java.lang.Object

org.apache.hadoop.hbase.metrics.impl.HistogramImpl

All Implemented Interfaces:

Histogram, Metric

@InterfaceAudience.Private
public class HistogramImpl
extends Object
implements Histogram

Custom histogram implementation based on FastLongHistogram. Dropwizard-based histograms are slow compared to this implementation, so we are using our implementation here. See HBASE-15222.

Field Summary

Fields

Modifier and Type	Field and Description
protected FastLongHistogram	histogram

Constructor Summary

Constructors

Modifier	Constructor and Description
	HistogramImpl()
protected	HistogramImpl(CounterImpl counter, FastLongHistogram histogram)
	HistogramImpl(int numBins, long min, long maxExpected)
	HistogramImpl(long maxExpected)

Method Summary

Methods

Modifier and Type	Method and Description
long	getCount()
long	getMax()
Snapshot	snapshot()
void	update(int value)
void	update(long value)

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

Constructor Detail

HistogramImpl

public HistogramImpl()

HistogramImpl

public HistogramImpl(long maxExpected)

HistogramImpl

public HistogramImpl(int numBins,
             long min,
             long maxExpected)

HistogramImpl

protected HistogramImpl(CounterImpl counter,
             FastLongHistogram histogram)

Method Detail

update

public void update(int value)

Specified by:

update in interface Histogram

update

public void update(long value)

Specified by:

update in interface Histogram

getCount

public long getCount()

Specified by:

getCount in interface Histogram

getMax

public long getMax()

snapshot

public Snapshot snapshot()

Specified by:

snapshot in interface Histogram