org.apache.flink.streaming.api.transformations

Class UnionTransformation<T>

java.lang.Object

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

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

Type Parameters:

T - The type of the elements that result from this UnionTransformation

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

This transformation represents a union of several input Transformations.

This does not create a physical operation, it only affects how upstream operations are connected to downstream operations.

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
UnionTransformation(List<Transformation<T>> inputs) Creates a new UnionTransformation from the given input Transformations.

Method Summary

Modifier and Type	Method and Description
List<Transformation<?>>	getInputs() Returns the transformations that are the immediate predecessors of the current transformation in the transformation graph.
List<Transformation<?>>	getTransitivePredecessors() 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, 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

UnionTransformation

public UnionTransformation(List<Transformation<T>> inputs)

Creates a new UnionTransformation from the given input Transformations.

The input Transformations must all have the same type.

Parameters:

inputs - The list of input Transformations

Method Detail

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>

getTransitivePredecessors

public List<Transformation<?>> getTransitivePredecessors()

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:

getTransitivePredecessors in class Transformation<T>

Returns:

The list of transitive predecessors.