[jira] [Created] (FLINK-15132) Checkpoint Coordinator does Checkpoint I/O in JobMaster Main Thread

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-15132:
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             Summary: Checkpoint Coordinator does Checkpoint I/O in JobMaster Main Thread
                 Key: FLINK-15132
                 URL: https://issues.apache.org/jira/browse/FLINK-15132
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
            Reporter: Stephan Ewen
             Fix For: 1.10.0


The {{PendingCheckpoint.completePendingCheckpoint()}} method is called synchronously from within the Scheduler / JobMaster Main Thread.

The method writes out the checkpoint metadata, which is a potentially blocking I/O method.
Because the target may block arbitrarily long (for example S3 when load throttling), this can bring down the entire cluster (blocking actor threads, heartbeat timeouts).




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