org.apache.flink.streaming.runtime.io

Class CheckpointBarrierAligner

java.lang.Object

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

org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner

@Internal
public class CheckpointBarrierAligner
extends CheckpointBarrierHandler

CheckpointBarrierAligner keep tracks of received CheckpointBarrier on given channels and controls the alignment, by deciding which channels should be blocked and when to release blocked channels.

Method Summary

Modifier and Type	Method and Description
protected void	beginNewAlignment(long checkpointId, int channelIndex)
void	checkpointSizeLimitExceeded(long maxBufferedBytes)
long	getAlignmentDurationNanos()
long	getLatestCheckpointId()
boolean	isBlocked(int channelIndex) Checks whether the channel with the given index is blocked.
protected void	onBarrier(int channelIndex) Blocks the given channel index, from which a barrier has been received.
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()
String	toString()

Methods inherited from class org.apache.flink.streaming.runtime.io.CheckpointBarrierHandler

notifyAbort, notifyAbortOnCancellationBarrier, notifyCheckpoint

Methods inherited from class java.lang.Object

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

Method Detail

releaseBlocksAndResetBarriers

public void releaseBlocksAndResetBarriers()

Specified by:

releaseBlocksAndResetBarriers in class CheckpointBarrierHandler

isBlocked

public boolean isBlocked(int channelIndex)

Description copied from class: CheckpointBarrierHandler

Checks whether the channel with the given index is blocked.

Specified by:

isBlocked in class CheckpointBarrierHandler

Parameters:

channelIndex - The channel index to check.

Returns:

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

Specified by:

processBarrier in class CheckpointBarrierHandler

Returns:

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

Throws:

Exception

beginNewAlignment

protected void beginNewAlignment(long checkpointId,
                                 int channelIndex)
                          throws IOException

Throws:

IOException

onBarrier

protected void onBarrier(int channelIndex)
                  throws IOException

Blocks the given channel index, from which a barrier has been received.

Parameters:

channelIndex - The channel index to block.

Throws:

IOException

processCancellationBarrier

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

Specified by:

processCancellationBarrier in class CheckpointBarrierHandler

Returns:

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

Throws:

Exception

processEndOfPartition

public boolean processEndOfPartition()
                              throws Exception

Specified by:

processEndOfPartition in class CheckpointBarrierHandler

Returns:

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

Throws:

Exception

getLatestCheckpointId

public long getLatestCheckpointId()

Specified by:

getLatestCheckpointId in class CheckpointBarrierHandler

getAlignmentDurationNanos

public long getAlignmentDurationNanos()

Specified by:

getAlignmentDurationNanos in class CheckpointBarrierHandler

toString

public String toString()

Overrides:

toString in class Object

checkpointSizeLimitExceeded

public void checkpointSizeLimitExceeded(long maxBufferedBytes)
                                 throws Exception

Specified by:

checkpointSizeLimitExceeded in class CheckpointBarrierHandler

Throws:

Exception