org.apache.flink.streaming.api.transformations

Class ReduceTransformation<IN,K>

java.lang.Object

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

org.apache.flink.streaming.api.transformations.PhysicalTransformation<IN>

org.apache.flink.streaming.api.transformations.ReduceTransformation<IN,K>

Type Parameters:

IN - The input and output type of the transformation.

K - The type of the key of the stream.

@Internal
public final class ReduceTransformation<IN,K>
extends PhysicalTransformation<IN>

A Transformation that describes a reduce operation on a KeyedStream.

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
ReduceTransformation(String name, int parallelism, Transformation<IN> input, ReduceFunction<IN> reducer, KeySelector<IN,K> keySelector, TypeInformation<K> keyTypeInfo, boolean parallelismConfigured)

Method Summary

Modifier and Type	Method and Description
ChainingStrategy	getChainingStrategy()
List<Transformation<?>>	getInputs() Returns the transformations that are the immediate predecessors of the current transformation in the transformation graph.
TypeInformation<IN>	getInputType() Returns the TypeInformation for the elements of the input.
KeySelector<IN,K>	getKeySelector()
TypeInformation<K>	getKeyTypeInfo()
ReduceFunction<IN>	getReducer()
List<Transformation<?>>	getTransitivePredecessors() Returns all transitive predecessor Transformations of this Transformation.
void	setChainingStrategy(ChainingStrategy strategy) Sets the chaining strategy of this Transformation.

Methods inherited from class org.apache.flink.streaming.api.transformations.PhysicalTransformation

isSupportsConcurrentExecutionAttempts, setSupportsConcurrentExecutionAttempts

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

ReduceTransformation

public ReduceTransformation(String name,
                            int parallelism,
                            Transformation<IN> input,
                            ReduceFunction<IN> reducer,
                            KeySelector<IN,K> keySelector,
                            TypeInformation<K> keyTypeInfo,
                            boolean parallelismConfigured)

Method Detail

setChainingStrategy

public void setChainingStrategy(ChainingStrategy strategy)

Description copied from class: PhysicalTransformation

Sets the chaining strategy of this Transformation.

Specified by:

setChainingStrategy in class PhysicalTransformation<IN>

getChainingStrategy

public ChainingStrategy getChainingStrategy()

getKeySelector

public KeySelector<IN,K> getKeySelector()

getKeyTypeInfo

public TypeInformation<K> getKeyTypeInfo()

getReducer

public ReduceFunction<IN> getReducer()

getInputType

public TypeInformation<IN> getInputType()

Returns the TypeInformation for the elements of the input.

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<IN>

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<IN>