org.apache.flink.runtime.io.network.api

类 CheckpointBarrier

java.lang.Object

org.apache.flink.runtime.event.AbstractEvent

org.apache.flink.runtime.event.RuntimeEvent

org.apache.flink.runtime.io.network.api.CheckpointBarrier

所有已实现的接口:

org.apache.flink.core.io.IOReadableWritable

public class CheckpointBarrier
extends RuntimeEvent

Checkpoint barriers are used to align checkpoints throughout the streaming topology. The barriers are emitted by the sources when instructed to do so by the JobManager. When operators receive a CheckpointBarrier on one of its inputs, it knows that this is the point between the pre-checkpoint and post-checkpoint data.

Once an operator has received a checkpoint barrier from all its input channels, it knows that a certain checkpoint is complete. It can trigger the operator specific checkpoint behavior and broadcast the barrier to downstream operators.

Depending on the semantic guarantees, may hold off post-checkpoint data until the checkpoint is complete (exactly once).

The checkpoint barrier IDs are strictly monotonous increasing.

构造器概要

构造器

构造器和说明
CheckpointBarrier(long id, long timestamp, CheckpointOptions checkpointOptions)

方法概要

限定符和类型	方法和说明
CheckpointBarrier	asUnaligned()
boolean	equals(Object other)
CheckpointOptions	getCheckpointOptions()
long	getId()
long	getTimestamp()
int	hashCode()
boolean	isCheckpoint()
void	read(org.apache.flink.core.memory.DataInputView in)
String	toString()
CheckpointBarrier	withOptions(CheckpointOptions checkpointOptions)
void	write(org.apache.flink.core.memory.DataOutputView out)

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

CheckpointBarrier

public CheckpointBarrier(long id,
                         long timestamp,
                         CheckpointOptions checkpointOptions)

方法详细资料

getId

public long getId()

getTimestamp

public long getTimestamp()

getCheckpointOptions

public CheckpointOptions getCheckpointOptions()

withOptions

public CheckpointBarrier withOptions(CheckpointOptions checkpointOptions)

write

public void write(org.apache.flink.core.memory.DataOutputView out)
           throws IOException

抛出:

IOException

read

public void read(org.apache.flink.core.memory.DataInputView in)
          throws IOException

抛出:

IOException

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

equals

public boolean equals(Object other)

覆盖:

equals 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object

isCheckpoint

public boolean isCheckpoint()

asUnaligned

public CheckpointBarrier asUnaligned()