org.apache.flink.streaming.api.transformations

类 FeedbackTransformation<T>

java.lang.Object

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

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

类型参数:

T - The type of the input elements and the feedback elements.

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

This represents a feedback point in a topology.

This is different from how iterations work in batch processing. Once a feedback point is defined you can connect one or several Transformations as a feedback edges. Operations downstream from the feedback point will receive elements from the input of this feedback point and from the feedback edges.

Both the partitioning of the input and the feedback edges is preserved. They can also have differing partitioning strategies. This requires, however, that the parallelism of the feedback Transformations must match the parallelism of the input Transformation.

The type of the input Transformation and the feedback Transformation must match.

字段概要

从类继承的字段 org.apache.flink.api.dag.Transformation

bufferTimeout, DEFAULT_MANAGED_MEMORY_WEIGHT, id, idCounter, name, outputType, typeUsed, UPPER_BOUND_MAX_PARALLELISM

构造器概要

构造器

构造器和说明
FeedbackTransformation(org.apache.flink.api.dag.Transformation<T> input, Long waitTime) Creates a new FeedbackTransformation from the given input.

方法概要

限定符和类型	方法和说明
void	addFeedbackEdge(org.apache.flink.api.dag.Transformation<T> transform) Adds a feedback edge.
List<org.apache.flink.api.dag.Transformation<T>>	getFeedbackEdges() Returns the list of feedback Transformations.
org.apache.flink.api.dag.Transformation<T>	getInput() Returns the input Transformation of this FeedbackTransformation.
Collection<org.apache.flink.api.dag.Transformation<?>>	getTransitivePredecessors()
Long	getWaitTime() Returns the wait time.

从类继承的方法 org.apache.flink.api.dag.Transformation

equals, getBufferTimeout, getCoLocationGroupKey, getId, getManagedMemoryWeight, getMaxParallelism, getMinResources, getName, getNewNodeId, getOutputType, getParallelism, getPreferredResources, getSlotSharingGroup, getUid, getUserProvidedNodeHash, hashCode, setBufferTimeout, setCoLocationGroupKey, setManagedMemoryWeight, setMaxParallelism, setName, setOutputType, setParallelism, setResources, setSlotSharingGroup, setUid, setUidHash, toString

从类继承的方法 java.lang.Object

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

构造器详细资料

FeedbackTransformation

public FeedbackTransformation(org.apache.flink.api.dag.Transformation<T> input,
                              Long waitTime)

Creates a new FeedbackTransformation from the given input.

参数:

input - The input Transformation

waitTime - The wait time of the feedback operator. After the time expires the operation will close and not receive any more feedback elements.

方法详细资料

getInput

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

Returns the input Transformation of this FeedbackTransformation.

addFeedbackEdge

public void addFeedbackEdge(org.apache.flink.api.dag.Transformation<T> transform)

Adds a feedback edge. The parallelism of the Transformation must match the parallelism of the input Transformation of this FeedbackTransformation

参数:

transform - The new feedback Transformation.

getFeedbackEdges

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

Returns the list of feedback Transformations.

getWaitTime

public Long getWaitTime()

Returns the wait time. This is the amount of time that the feedback operator keeps listening for feedback elements. Once the time expires the operation will close and will not receive further elements.

getTransitivePredecessors

public Collection<org.apache.flink.api.dag.Transformation<?>> getTransitivePredecessors()

指定者:

getTransitivePredecessors 在类中 org.apache.flink.api.dag.Transformation<T>