org.apache.flink.streaming.api.transformations

Class SourceTransformationWrapper<T>

java.lang.Object

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

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

Type Parameters:

T - The type of the elements in the input Transformation

@Internal
public class SourceTransformationWrapper<T>
extends Transformation<T>

This Transformation is a phantom transformation which is used to expose a default parallelism to downstream.

It is used only when the parallelism of the source transformation differs from the default parallelism, ensuring that the parallelism of downstream operations is not affected.

Moreover, this transformation does not have a corresponding TransformationTranslator, meaning it will not become a node in the StreamGraph.

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
SourceTransformationWrapper(Transformation<T> input)

Method Summary

Modifier and Type	Method and Description
Transformation<T>	getInput()
List<Transformation<?>>	getInputs() Returns the transformations that are the immediate predecessors of the current transformation in the transformation graph.
protected List<Transformation<?>>	getTransitivePredecessorsInternal() Returns all transitive predecessor Transformations of this Transformation.

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

SourceTransformationWrapper

public SourceTransformationWrapper(Transformation<T> input)

Method Detail

getInput

public Transformation<T> getInput()

getTransitivePredecessorsInternal

protected List<Transformation<?>> getTransitivePredecessorsInternal()

Description copied from class: Transformation

Returns all transitive predecessor Transformations of this Transformation. This is, for example, used when determining whether a feedback edge of an iteration actually has the iteration head as a predecessor.

Specified by:

getTransitivePredecessorsInternal in class Transformation<T>

Returns:

The list of transitive predecessors.

getInputs

public List<Transformation<?>> getInputs()

Description copied from class: Transformation

Returns the transformations that are the immediate predecessors of the current transformation in the transformation graph.

Specified by:

getInputs in class Transformation<T>