org.apache.flink.streaming.api.operators

Class PartitionReduceOperator<IN>

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<OUT>

org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator<IN,org.apache.flink.api.common.functions.ReduceFunction<IN>>

org.apache.flink.streaming.api.operators.PartitionReduceOperator<IN>

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.state.CheckpointListener, BoundedOneInput, Input<IN>, KeyContext, KeyContextHandler, OneInputStreamOperator<IN,IN>, org.apache.flink.streaming.api.operators.OutputTypeConfigurable<IN>, SetupableStreamOperator<IN>, StreamOperator<IN>, StreamOperatorStateHandler.CheckpointedStreamOperator, UserFunctionProvider<org.apache.flink.api.common.functions.ReduceFunction<IN>>, YieldingOperator<IN>

@Internal
public class PartitionReduceOperator<IN>
extends AbstractUdfStreamOperator<IN,org.apache.flink.api.common.functions.ReduceFunction<IN>>
implements OneInputStreamOperator<IN,IN>, BoundedOneInput

The PartitionReduceOperator is used to apply the reduce transformation on all records of each partition. Each partition contains all records of a subtask.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator

userFunction

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

chainingStrategy, config, lastRecordAttributes1, lastRecordAttributes2, latencyStats, LOG, metrics, output, processingTimeService, stateHandler, stateKeySelector1, stateKeySelector2, timeServiceManager

Constructor Summary

Constructors

Constructor and Description
PartitionReduceOperator(org.apache.flink.api.common.functions.ReduceFunction<IN> reduceFunction)

Method Summary

Modifier and Type	Method and Description
void	endInput() It is notified that no more data will arrive from the input.
OperatorAttributes	getOperatorAttributes() Called to get the OperatorAttributes of the operator.
void	processElement(StreamRecord<IN> element) Processes one element that arrived on this input of the MultipleInputStreamOperator.

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator

close, finish, getUserFunction, getUserFunctionParameters, initializeState, notifyCheckpointAborted, notifyCheckpointComplete, open, setOutputType, setup, snapshotState

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

getChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getStateKeySelector1, getStateKeySelector2, getTimeServiceManager, getUserCodeClassloader, hasKeyContext1, hasKeyContext2, initializeState, isUsingCustomRawKeyedState, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processRecordAttributes, processRecordAttributes1, processRecordAttributes2, processWatermark, processWatermark1, processWatermark2, processWatermarkStatus, processWatermarkStatus1, processWatermarkStatus2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setMailboxExecutor, setProcessingTimeService, snapshotState, useSplittableTimers

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.streaming.api.operators.OneInputStreamOperator

setKeyContextElement

Methods inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

close, finish, getMetricGroup, getOperatorID, initializeState, open, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotState

Methods inherited from interface org.apache.flink.api.common.state.CheckpointListener

notifyCheckpointAborted, notifyCheckpointComplete

Methods inherited from interface org.apache.flink.streaming.api.operators.KeyContext

getCurrentKey, setCurrentKey

Methods inherited from interface org.apache.flink.streaming.api.operators.Input

processLatencyMarker, processRecordAttributes, processWatermark, processWatermarkStatus

Methods inherited from interface org.apache.flink.streaming.api.operators.KeyContextHandler

hasKeyContext

Constructor Detail

PartitionReduceOperator

public PartitionReduceOperator(org.apache.flink.api.common.functions.ReduceFunction<IN> reduceFunction)

Method Detail

processElement

public void processElement(StreamRecord<IN> element)
                    throws Exception

Description copied from interface: Input

Processes one element that arrived on this input of the MultipleInputStreamOperator. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

processElement in interface Input<IN>

Throws:

Exception

endInput

public void endInput()
              throws Exception

Description copied from interface: BoundedOneInput

It is notified that no more data will arrive from the input.

Stateful operators need to be aware that a restart with rescaling may occur after receiving this notification. A changed source split assignment may imply that the same subtask of this operator that received endInput, has its state after endInput snapshotted, and will receive new data after restart. Hence, the state should not contain any finalization that would make it impossible to process new data.

WARNING: It is not safe to use this method to commit any transactions or other side effects! You can use this method to flush any buffered data that can later on be committed e.g. in a CheckpointListener.notifyCheckpointComplete(long).

NOTE: Given it is semantically very similar to the StreamOperator.finish() method. It might be dropped in favour of the other method at some point in time.

Specified by:

endInput in interface BoundedOneInput

Throws:

Exception

getOperatorAttributes

public OperatorAttributes getOperatorAttributes()

Description copied from interface: StreamOperator

Called to get the OperatorAttributes of the operator. If there is no defined attribute, a default OperatorAttributes is built.

Specified by:

getOperatorAttributes in interface StreamOperator<IN>

Returns:

OperatorAttributes of the operator.