org.apache.flink.streaming.runtime.io

类 CheckpointBarrierTracker

java.lang.Object

org.apache.flink.streaming.runtime.io.CheckpointBarrierHandler

org.apache.flink.streaming.runtime.io.CheckpointBarrierTracker

@Internal
public class CheckpointBarrierTracker
extends CheckpointBarrierHandler

The CheckpointBarrierTracker keeps track of what checkpoint barriers have been received from which input channels. Once it has observed all checkpoint barriers for a checkpoint ID, it notifies its listener of a completed checkpoint.

Unlike the CheckpointBarrierAligner, the BarrierTracker does not block the input channels that have sent barriers, so it cannot be used to gain "exactly-once" processing guarantees. It can, however, be used to gain "at least once" processing guarantees.

NOTE: This implementation strictly assumes that newer checkpoints have higher checkpoint IDs.

构造器概要

构造器

构造器和说明
CheckpointBarrierTracker(int totalNumberOfInputChannels)
CheckpointBarrierTracker(int totalNumberOfInputChannels, org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable toNotifyOnCheckpoint)

方法概要

限定符和类型	方法和说明
void	checkpointSizeLimitExceeded(long maxBufferedBytes)
long	getAlignmentDurationNanos()
long	getLatestCheckpointId()
boolean	isBlocked(int channelIndex) Checks whether the channel with the given index is blocked.
boolean	processBarrier(org.apache.flink.runtime.io.network.api.CheckpointBarrier receivedBarrier, int channelIndex, long bufferedBytes)
boolean	processCancellationBarrier(org.apache.flink.runtime.io.network.api.CancelCheckpointMarker cancelBarrier)
boolean	processEndOfPartition()
void	releaseBlocksAndResetBarriers()

从类继承的方法 org.apache.flink.streaming.runtime.io.CheckpointBarrierHandler

notifyAbort, notifyAbortOnCancellationBarrier, notifyCheckpoint

从类继承的方法 java.lang.Object

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

构造器详细资料

CheckpointBarrierTracker

public CheckpointBarrierTracker(int totalNumberOfInputChannels)

CheckpointBarrierTracker

public CheckpointBarrierTracker(int totalNumberOfInputChannels,
                                @Nullable
                                org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable toNotifyOnCheckpoint)

方法详细资料

releaseBlocksAndResetBarriers

public void releaseBlocksAndResetBarriers()

指定者:

releaseBlocksAndResetBarriers 在类中 CheckpointBarrierHandler

isBlocked

public boolean isBlocked(int channelIndex)

从类复制的说明: CheckpointBarrierHandler

Checks whether the channel with the given index is blocked.

指定者:

isBlocked 在类中 CheckpointBarrierHandler

参数:

channelIndex - The channel index to check.

返回:

True if the channel is blocked, false if not.

processBarrier

public boolean processBarrier(org.apache.flink.runtime.io.network.api.CheckpointBarrier receivedBarrier,
                              int channelIndex,
                              long bufferedBytes)
                       throws Exception

指定者:

processBarrier 在类中 CheckpointBarrierHandler

返回:

true if some blocked data should be unblocked/rolled over.

抛出:

Exception

processCancellationBarrier

public boolean processCancellationBarrier(org.apache.flink.runtime.io.network.api.CancelCheckpointMarker cancelBarrier)
                                   throws Exception

指定者:

processCancellationBarrier 在类中 CheckpointBarrierHandler

返回:

true if some blocked data should be unblocked/rolled over.

抛出:

Exception

processEndOfPartition

public boolean processEndOfPartition()
                              throws Exception

指定者:

processEndOfPartition 在类中 CheckpointBarrierHandler

返回:

true if some blocked data should be unblocked/rolled over.

抛出:

Exception

getLatestCheckpointId

public long getLatestCheckpointId()

指定者:

getLatestCheckpointId 在类中 CheckpointBarrierHandler

getAlignmentDurationNanos

public long getAlignmentDurationNanos()

指定者:

getAlignmentDurationNanos 在类中 CheckpointBarrierHandler

checkpointSizeLimitExceeded

public void checkpointSizeLimitExceeded(long maxBufferedBytes)
                                 throws Exception

指定者:

checkpointSizeLimitExceeded 在类中 CheckpointBarrierHandler

抛出:

Exception