1 .Apache Kafka x Apache Flink· 

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17 .Chandy-Lamport • • • 

18 .Exactly Once At least once + • • • • At least once + • • • • barrier • Region Failover: FLINK- 4256 • 

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28 .public interface CheckpointListener { /** * This method is called as a notification once a distributed checkpoint has been completed. * * Note that any exception during this method will not cause the checkpoint to * fail any more. * * @param checkpointId The ID of the checkpoint that has been completed. * @throws Exception */ void notifyCheckpointComplete(long checkpointId) throws Exception; } 

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