org.apache.flink.connector.file.table.stream.compact

Class CompactCoordinator

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<CompactMessages.CoordinatorOutput>

org.apache.flink.connector.file.table.stream.compact.CompactCoordinator

All Implemented Interfaces:

Serializable, CheckpointListener, Input<CompactMessages.CoordinatorInput>, KeyContext, KeyContextHandler, OneInputStreamOperator<CompactMessages.CoordinatorInput,CompactMessages.CoordinatorOutput>, SetupableStreamOperator<CompactMessages.CoordinatorOutput>, StreamOperator<CompactMessages.CoordinatorOutput>, StreamOperatorStateHandler.CheckpointedStreamOperator

@Internal
public class CompactCoordinator
extends AbstractStreamOperator<CompactMessages.CoordinatorOutput>
implements OneInputStreamOperator<CompactMessages.CoordinatorInput,CompactMessages.CoordinatorOutput>

This is the single (non-parallel) monitoring task which coordinate input files to compaction units. - Receives in-flight input files inside checkpoint. - Receives all upstream end input messages after the checkpoint completes successfully, starts coordination.

CompactMessages.CompactionUnit and CompactMessages.EndCompaction must be sent to the downstream in an orderly manner, while CompactMessages.EndCompaction is broadcast emitting, so unit and endCompaction use the broadcast emitting mechanism together. Since unit is broadcast, we want it to be processed by a single task, so we carry the ID in the unit and let the downstream task select its own unit.

NOTE: The coordination is a stable algorithm, which can ensure that the downstream can perform compaction at any time without worrying about fail over.

STATE: This operator stores input files in state, after the checkpoint completes successfully, input files are taken out from the state for coordination.

See Also:

Serialized Form

Field Summary

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

chainingStrategy, config, latencyStats, metrics, output, processingTimeService

Constructor Summary

Constructors

Constructor and Description
CompactCoordinator(SupplierWithException<FileSystem,IOException> fsFactory, long targetFileSize)

Method Summary

Modifier and Type	Method and Description
void	initializeState(StateInitializationContext context) Stream operators with state which can be restored need to override this hook method.
void	processElement(StreamRecord<CompactMessages.CoordinatorInput> element) Processes one element that arrived on this input of the MultipleInputStreamOperator.
void	snapshotState(StateSnapshotContext context) Stream operators with state, which want to participate in a snapshot need to override this hook method.

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

close, finish, getChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getTimeServiceManager, getUserCodeClassloader, hasKeyContext1, hasKeyContext2, initializeState, isUsingCustomRawKeyedState, notifyCheckpointAborted, notifyCheckpointComplete, open, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processWatermark, processWatermark1, processWatermark2, processWatermarkStatus, processWatermarkStatus1, processWatermarkStatus2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setProcessingTimeService, setup, snapshotState

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, processWatermark, processWatermarkStatus

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

hasKeyContext

Constructor Detail

CompactCoordinator

public CompactCoordinator(SupplierWithException<FileSystem,IOException> fsFactory,
                          long targetFileSize)

Method Detail

initializeState

public void initializeState(StateInitializationContext context)
                     throws Exception

Description copied from class: AbstractStreamOperator

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

Specified by:

initializeState in interface StreamOperatorStateHandler.CheckpointedStreamOperator

Overrides:

initializeState in class AbstractStreamOperator<CompactMessages.CoordinatorOutput>

Parameters:

context - context that allows to register different states.

Throws:

Exception

processElement

public void processElement(StreamRecord<CompactMessages.CoordinatorInput> 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<CompactMessages.CoordinatorInput>

Throws:

Exception

snapshotState

public void snapshotState(StateSnapshotContext context)
                   throws Exception

Description copied from class: AbstractStreamOperator

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

Specified by:

snapshotState in interface StreamOperatorStateHandler.CheckpointedStreamOperator

Overrides:

snapshotState in class AbstractStreamOperator<CompactMessages.CoordinatorOutput>

Parameters:

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

Throws:

Exception