org.apache.flink.api.java.functions

类 SampleWithFraction<T>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichMapPartitionFunction<T,T>

org.apache.flink.api.java.functions.SampleWithFraction<T>

类型参数:

T -

所有已实现的接口:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.MapPartitionFunction<T,T>, org.apache.flink.api.common.functions.RichFunction

@Internal
public class SampleWithFraction<T>
extends org.apache.flink.api.common.functions.RichMapPartitionFunction<T,T>

A map partition function wrapper for sampling algorithms with fraction, the sample algorithm takes the partition iterator as input.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
SampleWithFraction(boolean withReplacement, double fraction, long seed) Create a function instance of SampleWithFraction.

方法概要

限定符和类型	方法和说明
void	mapPartition(Iterable<T> values, org.apache.flink.util.Collector<T> out)

从类继承的方法 org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

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

SampleWithFraction

public SampleWithFraction(boolean withReplacement,
                          double fraction,
                          long seed)

Create a function instance of SampleWithFraction.

参数:

withReplacement - Whether element can be selected more than once.

fraction - Probability that each element is selected.

seed - random number generator seed.

方法详细资料

mapPartition

public void mapPartition(Iterable<T> values,
                         org.apache.flink.util.Collector<T> out)
                  throws Exception

指定者:

mapPartition 在接口中 org.apache.flink.api.common.functions.MapPartitionFunction<T,T>

指定者:

mapPartition 在类中 org.apache.flink.api.common.functions.RichMapPartitionFunction<T,T>

抛出:

Exception