org.apache.hadoop.hbase.metrics.impl

类 FastLongHistogram

java.lang.Object

org.apache.hadoop.hbase.metrics.impl.FastLongHistogram

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class FastLongHistogram
extends Object

FastLongHistogram is a thread-safe class that estimate distribution of data and computes the quantiles.

字段概要

字段

限定符和类型	字段和说明
static int	DEFAULT_NBINS Default number of bins.
static double[]	DEFAULT_QUANTILES

构造器概要

构造器

构造器和说明
FastLongHistogram() Constructor.
FastLongHistogram(int numOfBins) Constructor.
FastLongHistogram(int numOfBins, long min, long max) Constructor setting the bins assuming a uniform distribution within a range.

方法概要

方法

限定符和类型	方法和说明
void	add(long value, long count) Adds a value to the histogram.
long	getCount()
long	getMax()
long	getMean()
long	getMin()
long	getNumAtOrBelow(long value)
long[]	getQuantiles()
long[]	getQuantiles(double[] quantiles) Computes the quantiles give the ratios.
Snapshot	snapshotAndReset() Resets the histogram for new counting.

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_NBINS

public static final int DEFAULT_NBINS

Default number of bins.

另请参阅:

常量字段值

DEFAULT_QUANTILES

public static final double[] DEFAULT_QUANTILES

构造器详细资料

FastLongHistogram

public FastLongHistogram()

Constructor.

FastLongHistogram

public FastLongHistogram(int numOfBins)

Constructor.

参数:

numOfBins - the number of bins for the histogram. A larger value results in more precise results but with lower efficiency, and vice versus.

FastLongHistogram

public FastLongHistogram(int numOfBins,
                 long min,
                 long max)

Constructor setting the bins assuming a uniform distribution within a range.

参数:

numOfBins - the number of bins for the histogram. A larger value results in more precise results but with lower efficiency, and vice versus.

min - lower bound of the region, inclusive.

max - higher bound of the region, inclusive.

方法详细资料

add

public void add(long value,
       long count)

Adds a value to the histogram.

getQuantiles

public long[] getQuantiles(double[] quantiles)

Computes the quantiles give the ratios.

getQuantiles

public long[] getQuantiles()

getMin

public long getMin()

getMax

public long getMax()

getCount

public long getCount()

getMean

public long getMean()

getNumAtOrBelow

public long getNumAtOrBelow(long value)

snapshotAndReset

public Snapshot snapshotAndReset()

Resets the histogram for new counting.