org.apache.flink.streaming.api.transformations

类 CoFeedbackTransformation<F>

java.lang.Object

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

org.apache.flink.streaming.api.transformations.CoFeedbackTransformation<F>

类型参数:

F - The type of the feedback elements.

@Internal
public class CoFeedbackTransformation<F>
extends org.apache.flink.api.dag.Transformation<F>

This represents a feedback point in a topology. The type of the feedback elements need not match the type of the upstream Transformation because the only allowed operations after a CoFeedbackTransformation are TwoInputTransformations. The upstream Transformation will be connected to the first input of the Co-Transform while the feedback edges will be connected to the second input.

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 upstream Transformation is not wired to this CoFeedbackTransformation. It is instead directly wired to the TwoInputTransformation after this CoFeedbackTransformation.

This is different from Iterations in batch processing.

另请参阅:

FeedbackTransformation

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
CoFeedbackTransformation(int parallelism, org.apache.flink.api.common.typeinfo.TypeInformation<F> feedbackType, Long waitTime) Creates a new CoFeedbackTransformation 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<F> transform) Adds a feedback edge.
List<org.apache.flink.api.dag.Transformation<F>>	getFeedbackEdges() Returns the list of feedback Transformations.
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

CoFeedbackTransformation

public CoFeedbackTransformation(int parallelism,
                                org.apache.flink.api.common.typeinfo.TypeInformation<F> feedbackType,
                                Long waitTime)

Creates a new CoFeedbackTransformation from the given input.

参数:

parallelism - The parallelism of the upstream Transformation and the feedback edges.

feedbackType - The type of the feedback edges

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

addFeedbackEdge

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

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

参数:

transform - The new feedback Transformation.

getFeedbackEdges

public List<org.apache.flink.api.dag.Transformation<F>> 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<F>