IN - Type of the elements that this function processes.OUT - The type of the elements returned by the user-defined function.@Internal public class GroupReduceOperator<IN,OUT> extends AbstractUdfStreamOperator<OUT,GroupReduceFunction<IN,OUT>> implements OneInputStreamOperator<IN,OUT>
GroupReduceFunction on a bounded DataStream.userFunctionchainingStrategy, config, latencyStats, LOG, metrics, output, processingTimeService| Constructor and Description |
|---|
GroupReduceOperator(GroupReduceFunction<IN,OUT> userFunction) |
| Modifier and Type | Method and Description |
|---|---|
void |
finish()
This method is called at the end of data processing.
|
void |
open()
This method is called immediately before any elements are processed, it should contain the
operator's initialization logic, e.g. state initialization.
|
void |
processElement(StreamRecord<IN> element)
Processes one element that arrived on this input of the
MultipleInputStreamOperator. |
close, getUserFunction, getUserFunctionParameters, initializeState, notifyCheckpointAborted, notifyCheckpointComplete, setOutputType, setup, snapshotStategetChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getTimeServiceManager, getUserCodeClassloader, hasKeyContext1, hasKeyContext2, initializeState, isUsingCustomRawKeyedState, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processWatermark, processWatermark1, processWatermark2, processWatermarkStatus, processWatermarkStatus1, processWatermarkStatus2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setProcessingTimeService, snapshotStateclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitsetKeyContextElementclose, getMetricGroup, getOperatorID, initializeState, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotStatenotifyCheckpointAborted, notifyCheckpointCompletegetCurrentKey, setCurrentKeyprocessLatencyMarker, processWatermark, processWatermarkStatushasKeyContextpublic GroupReduceOperator(GroupReduceFunction<IN,OUT> userFunction)
public void open()
throws Exception
AbstractStreamOperatorThe default implementation does nothing.
open in interface StreamOperator<OUT>open in class AbstractUdfStreamOperator<OUT,GroupReduceFunction<IN,OUT>>Exception - An exception in this method causes the operator to fail.public void processElement(StreamRecord<IN> element) throws Exception
InputMultipleInputStreamOperator.
This method is guaranteed to not be called concurrently with other methods of the operator.processElement in interface Input<IN>Exceptionpublic void finish()
throws Exception
StreamOperatorThe method is expected to flush all remaining buffered data. Exceptions during this flushing of buffered data should be propagated, in order to cause the operation to be recognized as failed, because the last data items are not processed properly.
After this method is called, no more records can be produced for the downstream operators.
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:This method does not need to close any resources. You should release external
resources in the StreamOperator.close() method.
finish in interface StreamOperator<OUT>finish in class AbstractUdfStreamOperator<OUT,GroupReduceFunction<IN,OUT>>Exception - An exception in this method causes the operator to fail.Copyright © 2014–2024 The Apache Software Foundation. All rights reserved.