org.apache.hadoop.hbase.util

类 LossyCounting

java.lang.Object

org.apache.hadoop.hbase.util.LossyCounting

@InterfaceAudience.Public
public class LossyCounting
extends Object

LossyCounting utility, bounded data structure that maintains approximate high frequency elements in data stream. Bucket size is 1 / error rate. (Error rate is 0.02 by default) Lemma If element
does not appear in set, then is frequency is less than e * N (N is total element counts until now.) Based on paper: http://www.vldb.org/conf/2002/S10P03.pdf

构造器概要

构造器

构造器和说明
LossyCounting()
LossyCounting(double errorRate)

方法概要

限定符和类型	方法和说明
Set<String>	addByOne(String key)
boolean	contains(String key)
long	getBuketSize()
long	getCurrentTerm()
long	getDataSize()

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

LossyCounting

public LossyCounting(double errorRate)

LossyCounting

public LossyCounting()

方法详细资料

addByOne

public Set<String> addByOne(String key)

getBuketSize

public long getBuketSize()

getDataSize

public long getDataSize()

contains

public boolean contains(String key)

getCurrentTerm

public long getCurrentTerm()