Package org.apache.iceberg.metrics

Class FixedReservoirHistogram

java.lang.Object

org.apache.iceberg.metrics.FixedReservoirHistogram

All Implemented Interfaces:

Histogram

public class FixedReservoirHistogram
extends Object
implements Histogram

A Histogram implementation with reservoir sampling.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.iceberg.metrics.Histogram

Histogram.Statistics

Constructor Summary

Constructors

Constructor	Description
FixedReservoirHistogram(int reservoirSize)

Method Summary

Modifier and Type	Method	Description
int	count()	Return the number of observations.
Histogram.Statistics	statistics()	Naive algorithm for calculating variance: https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
void	update(long value)	Update the histogram with a new value observed.

Methods inherited from class java.lang.Object

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

Constructor Details

FixedReservoirHistogram

public FixedReservoirHistogram(int reservoirSize)

Method Details

count

public int count()

Description copied from interface: Histogram

Return the number of observations.

Specified by:

count in interface Histogram

update

public void update(long value)

Description copied from interface: Histogram

Update the histogram with a new value observed.

Specified by:

update in interface Histogram

statistics

public Histogram.Statistics statistics()

Naive algorithm for calculating variance: https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance

Specified by:

statistics in interface Histogram