org.apache.hadoop.hbase.util

类 ExponentialMovingAverage

java.lang.Object

org.apache.hadoop.hbase.util.MovingAverage

org.apache.hadoop.hbase.util.WindowMovingAverage

org.apache.hadoop.hbase.util.ExponentialMovingAverage

@InterfaceAudience.Private
public class ExponentialMovingAverage
extends WindowMovingAverage

EMA is similar to WeightedMovingAverage in weighted, but the weighting factor decrease exponentially. It brings benefits that it is more sensitive, and can see the trends easily.

字段概要

从类继承的字段 org.apache.hadoop.hbase.util.WindowMovingAverage

DEFAULT_SIZE, lastN, mostRecent, oneRound

从类继承的字段 org.apache.hadoop.hbase.util.MovingAverage

label

构造器概要

构造器

构造器和说明
ExponentialMovingAverage(String label)
ExponentialMovingAverage(String label, double alpha)
ExponentialMovingAverage(String label, int size)
ExponentialMovingAverage(String label, int size, double alpha)

方法概要

限定符和类型	方法和说明
double	getAverageTime() Get average execution time of the measured method.
void	updateMostRecentTime(long elapsed) Update the most recent data.

从类继承的方法 org.apache.hadoop.hbase.util.WindowMovingAverage

enoughStatistics, getMostRecentPosistion, getNumberOfStatistics, getStatisticsAtIndex, moveForwardMostRecentPosistion

从类继承的方法 org.apache.hadoop.hbase.util.MovingAverage

measure, start, stop

从类继承的方法 java.lang.Object

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

构造器详细资料

ExponentialMovingAverage

public ExponentialMovingAverage(String label)

ExponentialMovingAverage

public ExponentialMovingAverage(String label,
                                double alpha)

ExponentialMovingAverage

public ExponentialMovingAverage(String label,
                                int size)

ExponentialMovingAverage

public ExponentialMovingAverage(String label,
                                int size,
                                double alpha)

方法详细资料

updateMostRecentTime

public void updateMostRecentTime(long elapsed)

从类复制的说明: MovingAverage

Update the most recent data.

覆盖:

updateMostRecentTime 在类中 WindowMovingAverage

参数:

elapsed - elapsed time of the most recent measurement

getAverageTime

public double getAverageTime()

从类复制的说明: MovingAverage

Get average execution time of the measured method.

覆盖:

getAverageTime 在类中 WindowMovingAverage

返回:

average time in ns