[jira] [Created] (FLINK-20846) Decouple checkpoint services from CheckpointCoordinator

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-20846:
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             Summary: Decouple checkpoint services from CheckpointCoordinator
                 Key: FLINK-20846
                 URL: https://issues.apache.org/jira/browse/FLINK-20846
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.13.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.13.0


In order to reuse checkpoints across different {{ExecutionGraph}} instances (w/o HA), we need to decouple the checkpoint services {{CompletedCheckpointStore}} and {{CheckpointIDCounter}} from the {{CheckpointCoordinator}}. The reason is that the {{CheckpointCoordinator}} is bound to the lifetime of an {{ExecutionGraph}} and shuts the services down once the {{ExecutionGraph}} reaches a terminal state. Once this is no longer the case, it would be possible to create a new {{ExecutionGraph}} which can resume from a previous checkpoint if the appropriate {{CompletedCheckpointStore}} is provided.

For future scheduler implementations which want to reuse the {{ExecutionGraph}} but need to create different instances this is a requirement to support state recovery.



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