Package org.apache.flink.streaming.api.datastream

Class SideOutputDataStream<T>

java.lang.Object

org.apache.flink.streaming.api.datastream.DataStream<T>

org.apache.flink.streaming.api.datastream.SideOutputDataStream<T>

Type Parameters:

T - The type of the elements in this stream.

@Public
public class SideOutputDataStream<T>
extends DataStream<T>

A SideOutputDataStream represents a DataStream that contains elements that are emitted from upstream into a side output with some tag.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.datastream.DataStream

DataStream.Collector<T>

Field Summary

Fields inherited from class org.apache.flink.streaming.api.datastream.DataStream

environment, transformation

Constructor Summary

Constructors

Constructor	Description
SideOutputDataStream(StreamExecutionEnvironment environment, SideOutputTransformation<T> transformation)	Creates a new SideOutputDataStream in the given execution environment.

Method Summary

Modifier and Type	Method	Description
CachedDataStream<T>	cache()	Caches the intermediate result of the transformation.

Methods inherited from class org.apache.flink.streaming.api.datastream.DataStream

addSink, assignTimestampsAndWatermarks, broadcast, broadcast, clean, coGroup, collectAsync, collectAsync, connect, connect, countWindowAll, countWindowAll, doTransform, executeAndCollect, executeAndCollect, executeAndCollect, executeAndCollect, filter, flatMap, flatMap, forward, fullWindowPartition, getExecutionConfig, getExecutionEnvironment, getId, getMinResources, getParallelism, getPreferredResources, getTransformation, getType, global, join, keyBy, keyBy, keyBy, map, map, partitionCustom, print, print, printToErr, printToErr, process, process, project, rebalance, rescale, setConnectionType, shuffle, sinkTo, sinkTo, transform, transform, union, windowAll, writeToSocket, writeUsingOutputFormat

Methods inherited from class java.lang.Object

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

Constructor Details

SideOutputDataStream

public SideOutputDataStream(StreamExecutionEnvironment environment,
 SideOutputTransformation<T> transformation)

Creates a new SideOutputDataStream in the given execution environment.

Parameters:

environment - The StreamExecutionEnvironment

transformation - The SideOutputTransformation

Method Details

cache

@PublicEvolving
public CachedDataStream<T> cache()

Caches the intermediate result of the transformation. Only support bounded streams and currently only block mode is supported. The cache is generated lazily at the first time the intermediate result is computed. The cache will be clear when CachedDataStream.invalidate() called or the StreamExecutionEnvironment close.

Returns:

CachedDataStream that can use in later job to reuse the cached intermediate result.