org.apache.hadoop.hbase.util

Class WeightedMovingAverage<T>

java.lang.Object

org.apache.hadoop.hbase.util.MovingAverage<T>

org.apache.hadoop.hbase.util.WindowMovingAverage<T>

org.apache.hadoop.hbase.util.WeightedMovingAverage<T>

@InterfaceAudience.Private
public class WeightedMovingAverage<T>
extends WindowMovingAverage<T>

Different from SMA SimpleMovingAverage, WeightedMovingAverage gives each data different weight. And it is based on WindowMovingAverage, such that it only focus on the last N.

Field Summary

Fields

Modifier and Type	Field and Description
private int[]	coefficient
private int	denominator

Fields inherited from class org.apache.hadoop.hbase.util.WindowMovingAverage

DEFAULT_SIZE, lastN, mostRecent, oneRound

Fields inherited from class org.apache.hadoop.hbase.util.MovingAverage

label

Constructor Summary

Constructors

Constructor and Description
WeightedMovingAverage(String label)
WeightedMovingAverage(String label, int size)

Method Summary

Modifier and Type	Method and Description
double	getAverageTime() Get average execution time of the measured method.

Methods inherited from class org.apache.hadoop.hbase.util.WindowMovingAverage

enoughStatistics, getMostRecentPosition, getNumberOfStatistics, getStatisticsAtIndex, moveForwardMostRecentPosition, updateMostRecentTime

Methods inherited from class org.apache.hadoop.hbase.util.MovingAverage

measure, start, stop

Methods inherited from class java.lang.Object

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

Field Detail

coefficient

private int[] coefficient

denominator

private int denominator

Constructor Detail

WeightedMovingAverage

public WeightedMovingAverage(String label)

WeightedMovingAverage

public WeightedMovingAverage(String label,
                             int size)

Method Detail

getAverageTime

public double getAverageTime()

Description copied from class: MovingAverage

Get average execution time of the measured method.

Overrides:

getAverageTime in class WindowMovingAverage<T>

Returns:

average time in ns