[jira] [Created] (FLINK-5065) Resource leaks in case of lost checkpoint messages

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-5065:
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             Summary: Resource leaks in case of lost checkpoint messages
                 Key: FLINK-5065
                 URL: https://issues.apache.org/jira/browse/FLINK-5065
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
    Affects Versions: 1.1.3, 1.2.0
            Reporter: Till Rohrmann
             Fix For: 1.2.0


In case of lost checkpoint messages ({{AbstractCheckpointMessage}}) there won't be a clean up of the contained state handle done. This can happen in case of a JM crash if the TM had just sent a checkpoint message to the JM. Upon recovery, the JM won't notice that there was a checkpoint message which it had to handle.

One way to mitigate the problem is to let the TM expect a response from the JM and if the JM failed to respond in time, to discard the state handle of the checkpoint message. Moreover, the JM could register in a fault tolerant store that it started a pending checkpoint. The entry should contain enough information (e.g. path for {{FileSystemStateBackend}}) to clean up a pending checkpoint with potentially lost checkpoint messages upon recovery of the JM.



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