org.apache.flink.streaming.api.transformations

Class CacheTransformation<T>

java.lang.Object

org.apache.flink.api.dag.Transformation<T>

org.apache.flink.streaming.api.transformations.CacheTransformation<T>

Type Parameters:

T - The type of the elements in the cache intermediate result.

@Internal
public class CacheTransformation<T>
extends org.apache.flink.api.dag.Transformation<T>

When in batch mode, the CacheTransformation represents the intermediate result of the upper stream should be cached when it is computed at the first time. And it consumes the cached intermediate result in later jobs. In stream mode, it has no affect.

Field Summary

Fields inherited from class org.apache.flink.api.dag.Transformation

bufferTimeout, description, id, name, outputType, typeUsed, UPPER_BOUND_MAX_PARALLELISM

Constructor Summary

Constructors

Constructor and Description
CacheTransformation(org.apache.flink.api.dag.Transformation<T> transformationToCache, String name) Creates a new Transformation with the given name, output type and parallelism.

Method Summary

Modifier and Type	Method and Description
org.apache.flink.util.AbstractID	getDatasetId()
List<org.apache.flink.api.dag.Transformation<?>>	getInputs()
org.apache.flink.api.dag.Transformation<T>	getTransformationToCache()
protected List<org.apache.flink.api.dag.Transformation<?>>	getTransitivePredecessorsInternal()
boolean	isCached()
void	setCached(boolean cached)

Methods inherited from class org.apache.flink.api.dag.Transformation

declareManagedMemoryUseCaseAtOperatorScope, declareManagedMemoryUseCaseAtSlotScope, equals, getBufferTimeout, getCoLocationGroupKey, getDescription, getId, getManagedMemoryOperatorScopeUseCaseWeights, getManagedMemorySlotScopeUseCases, getMaxParallelism, getMinResources, getName, getNewNodeId, getOutputType, getParallelism, getPreferredResources, getSlotSharingGroup, getTransitivePredecessors, getUid, getUserProvidedNodeHash, hashCode, isParallelismConfigured, setBufferTimeout, setCoLocationGroupKey, setDescription, setMaxParallelism, setName, setOutputType, setParallelism, setParallelism, setResources, setSlotSharingGroup, setSlotSharingGroup, setUid, setUidHash, toString, updateManagedMemoryStateBackendUseCase

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CacheTransformation

public CacheTransformation(org.apache.flink.api.dag.Transformation<T> transformationToCache,
                           String name)

Creates a new Transformation with the given name, output type and parallelism.

Parameters:

name - The name of the Transformation, this will be shown in Visualizations and the Log

Method Detail

getTransitivePredecessorsInternal

protected List<org.apache.flink.api.dag.Transformation<?>> getTransitivePredecessorsInternal()

Specified by:

getTransitivePredecessorsInternal in class org.apache.flink.api.dag.Transformation<T>

getInputs

public List<org.apache.flink.api.dag.Transformation<?>> getInputs()

Specified by:

getInputs in class org.apache.flink.api.dag.Transformation<T>

getDatasetId

public org.apache.flink.util.AbstractID getDatasetId()

getTransformationToCache

public org.apache.flink.api.dag.Transformation<T> getTransformationToCache()

setCached

public void setCached(boolean cached)

isCached

public boolean isCached()