org.apache.flink.runtime.checkpoint

Interface OperatorCoordinatorCheckpointContext

All Superinterfaces:

org.apache.flink.api.common.state.CheckpointListener, OperatorInfo

All Known Implementing Classes:

OperatorCoordinatorHolder

public interface OperatorCoordinatorCheckpointContext
extends OperatorInfo, org.apache.flink.api.common.state.CheckpointListener

This context is the interface through which the CheckpointCoordinator interacts with an OperatorCoordinator during checkpointing and checkpoint restoring.

Method Summary

Modifier and Type	Method and Description
void	abortCurrentTriggering()
void	checkpointCoordinator(long checkpointId, CompletableFuture<byte[]> result)
default void	notifyCheckpointAborted(long checkpointId) We override the method here to remove the checked exception.
void	notifyCheckpointComplete(long checkpointId) We override the method here to remove the checked exception.
void	resetToCheckpoint(long checkpointId, byte[] checkpointData) Resets the coordinator to the checkpoint with the given state.
void	subtaskReset(int subtask, long checkpointId) Called if a task is recovered as part of a partial failover, meaning a failover handled by the scheduler's failover strategy (by default recovering a pipelined region).

Methods inherited from interface org.apache.flink.runtime.operators.coordination.OperatorInfo

currentParallelism, getIds, maxParallelism, operatorId

Method Detail

checkpointCoordinator

void checkpointCoordinator(long checkpointId,
                           CompletableFuture<byte[]> result)
                    throws Exception

Throws:

Exception

abortCurrentTriggering

void abortCurrentTriggering()

notifyCheckpointComplete

void notifyCheckpointComplete(long checkpointId)

We override the method here to remove the checked exception. Please check the Java docs of CheckpointListener.notifyCheckpointComplete(long) for more detail semantic of the method.

Specified by:

notifyCheckpointComplete in interface org.apache.flink.api.common.state.CheckpointListener

notifyCheckpointAborted

default void notifyCheckpointAborted(long checkpointId)

We override the method here to remove the checked exception. Please check the Java docs of CheckpointListener.notifyCheckpointAborted(long) for more detail semantic of the method.

Specified by:

notifyCheckpointAborted in interface org.apache.flink.api.common.state.CheckpointListener

resetToCheckpoint

void resetToCheckpoint(long checkpointId,
                       @Nullable
                       byte[] checkpointData)
                throws Exception

Resets the coordinator to the checkpoint with the given state.

This method is called with a null state argument in the following situations:

• There is a recovery and there was no completed checkpoint yet.
• There is a recovery from a completed checkpoint/savepoint but it contained no state for the coordinator.

In both cases, the coordinator should reset to an empty (new) state.

Throws:

Exception

subtaskReset

void subtaskReset(int subtask,
                  long checkpointId)

Called if a task is recovered as part of a partial failover, meaning a failover handled by the scheduler's failover strategy (by default recovering a pipelined region). The method is invoked for each subtask involved in that partial failover.

In contrast to this method, the resetToCheckpoint(long, byte[]) method is called in the case of a global failover, which is the case when the coordinator (JobManager) is recovered.