org.apache.flink.api.java.functions

Class 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>

Type Parameters:

T -

All Implemented Interfaces:

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.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SampleWithFraction(boolean withReplacement, double fraction, long seed) Create a function instance of SampleWithFraction.

Method Summary

Modifier and Type	Method and Description
void	mapPartition(Iterable<T> values, org.apache.flink.util.Collector<T> out)

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

SampleWithFraction

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

Create a function instance of SampleWithFraction.

Parameters:

withReplacement - Whether element can be selected more than once.

fraction - Probability that each element is selected.

seed - random number generator seed.

Method Detail

mapPartition

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

Specified by:

mapPartition in interface org.apache.flink.api.common.functions.MapPartitionFunction<T,T>

Specified by:

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

Throws:

Exception