org.apache.flink.streaming.api.functions.source

类 ContinuousFileReaderOperator<OUT>

java.lang.Object

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

org.apache.flink.streaming.api.functions.source.ContinuousFileReaderOperator<OUT>

所有已实现的接口:

Serializable, org.apache.flink.runtime.state.CheckpointListener, KeyContext, OneInputStreamOperator<TimestampedFileInputSplit,OUT>, OutputTypeConfigurable<OUT>, SetupableStreamOperator<OUT>, StreamOperator<OUT>, org.apache.flink.util.Disposable

@Internal
public class ContinuousFileReaderOperator<OUT>
extends AbstractStreamOperator<OUT>
implements OneInputStreamOperator<TimestampedFileInputSplit,OUT>, OutputTypeConfigurable<OUT>

The operator that reads the splits received from the preceding ContinuousFileMonitoringFunction. Contrary to the ContinuousFileMonitoringFunction which has a parallelism of 1, this operator can have DOP > 1.

As soon as a split descriptor is received, it is put in a queue, and have another thread read the actual data of the split. This architecture allows the separation of the reading thread from the one emitting the checkpoint barriers, thus removing any potential back-pressure.

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 org.apache.flink.streaming.api.operators.AbstractStreamOperator

AbstractStreamOperator.CountingOutput<OUT>

字段概要

从类继承的字段 org.apache.flink.streaming.api.operators.AbstractStreamOperator

chainingStrategy, config, latencyStats, metrics, output, timeServiceManager

构造器概要

构造器

构造器和说明
ContinuousFileReaderOperator(org.apache.flink.api.common.io.FileInputFormat<OUT> format)

方法概要

限定符和类型	方法和说明
void	close() This method is called after all records have been added to the operators via the methods OneInputStreamOperator.processElement(StreamRecord), or TwoInputStreamOperator.processElement1(StreamRecord) and TwoInputStreamOperator.processElement2(StreamRecord).
void	dispose() This method is called at the very end of the operator's life, both in the case of a successful completion of the operation, and in the case of a failure and canceling.
void	initializeState(org.apache.flink.runtime.state.StateInitializationContext context) Stream operators with state which can be restored need to override this hook method.
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<TimestampedFileInputSplit> element) Processes one element that arrived at this operator.
void	processWatermark(Watermark mark) Processes a Watermark.
void	setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo, org.apache.flink.api.common.ExecutionConfig executionConfig) Is called by the org.apache.flink.streaming.api.graph.StreamGraph#addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated.
void	snapshotState(org.apache.flink.runtime.state.StateSnapshotContext context) Stream operators with state, which want to participate in a snapshot need to override this hook method.

从类继承的方法 org.apache.flink.streaming.api.operators.AbstractStreamOperator

getChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getUserCodeClassloader, initializeState, notifyCheckpointComplete, numEventTimeTimers, numProcessingTimeTimers, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processWatermark1, processWatermark2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setup, snapshotState

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.streaming.api.operators.OneInputStreamOperator

processLatencyMarker

从接口继承的方法 org.apache.flink.streaming.api.operators.StreamOperator

getChainingStrategy, getMetricGroup, getOperatorID, initializeState, prepareSnapshotPreBarrier, setChainingStrategy, setKeyContextElement1, setKeyContextElement2, snapshotState

从接口继承的方法 org.apache.flink.runtime.state.CheckpointListener

notifyCheckpointComplete

从接口继承的方法 org.apache.flink.streaming.api.operators.KeyContext

getCurrentKey, setCurrentKey

构造器详细资料

ContinuousFileReaderOperator

public ContinuousFileReaderOperator(org.apache.flink.api.common.io.FileInputFormat<OUT> format)

方法详细资料

setOutputType

public void setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo,
                          org.apache.flink.api.common.ExecutionConfig executionConfig)

从接口复制的说明: OutputTypeConfigurable

Is called by the org.apache.flink.streaming.api.graph.StreamGraph#addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated. The method is called with the output TypeInformation which is also used for the StreamTask output serializer.

指定者:

setOutputType 在接口中 OutputTypeConfigurable<OUT>

参数:

outTypeInfo - Output type information of the StreamTask

executionConfig - Execution configuration

initializeState

public void initializeState(org.apache.flink.runtime.state.StateInitializationContext context)
                     throws Exception

从类复制的说明: AbstractStreamOperator

Stream operators with state which can be restored need to override this hook method.

覆盖:

initializeState 在类中 AbstractStreamOperator<OUT>

参数:

context - context that allows to register different states.

抛出:

Exception

open

public void open()
          throws Exception

从类复制的说明: AbstractStreamOperator

This method is called immediately before any elements are processed, it should contain the operator's initialization logic, e.g. state initialization.

The default implementation does nothing.

指定者:

open 在接口中 StreamOperator<OUT>

覆盖:

open 在类中 AbstractStreamOperator<OUT>

抛出:

Exception - An exception in this method causes the operator to fail.

processElement

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

从接口复制的说明: OneInputStreamOperator

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

指定者:

processElement 在接口中 OneInputStreamOperator<TimestampedFileInputSplit,OUT>

抛出:

Exception

processWatermark

public void processWatermark(Watermark mark)
                      throws Exception

从接口复制的说明: OneInputStreamOperator

Processes a Watermark. This method is guaranteed to not be called concurrently with other methods of the operator.

指定者:

processWatermark 在接口中 OneInputStreamOperator<TimestampedFileInputSplit,OUT>

覆盖:

processWatermark 在类中 AbstractStreamOperator<OUT>

抛出:

Exception

另请参阅:

Watermark

dispose

public void dispose()
             throws Exception

从类复制的说明: AbstractStreamOperator

This method is called at the very end of the operator's life, both in the case of a successful completion of the operation, and in the case of a failure and canceling.

This method is expected to make a thorough effort to release all resources that the operator has acquired.

指定者:

dispose 在接口中 StreamOperator<OUT>

指定者:

dispose 在接口中 org.apache.flink.util.Disposable

覆盖:

dispose 在类中 AbstractStreamOperator<OUT>

抛出:

Exception

close

public void close()
           throws Exception

从类复制的说明: AbstractStreamOperator

This method is called after all records have been added to the operators via the methods OneInputStreamOperator.processElement(StreamRecord), or TwoInputStreamOperator.processElement1(StreamRecord) and TwoInputStreamOperator.processElement2(StreamRecord).

The method is expected to flush all remaining buffered data. Exceptions during this flushing of buffered should be propagated, in order to cause the operation to be recognized asa failed, because the last data items are not processed properly.

指定者:

close 在接口中 StreamOperator<OUT>

覆盖:

close 在类中 AbstractStreamOperator<OUT>

抛出:

Exception - An exception in this method causes the operator to fail.

snapshotState

public void snapshotState(org.apache.flink.runtime.state.StateSnapshotContext context)
                   throws Exception

从类复制的说明: AbstractStreamOperator

Stream operators with state, which want to participate in a snapshot need to override this hook method.

覆盖:

snapshotState 在类中 AbstractStreamOperator<OUT>

参数:

context - context that provides information and means required for taking a snapshot

抛出:

Exception