[jira] [Created] (FLINK-17808) Rename checkpoint meta file to "_metadata" until it has completed writing

[Shang Yuanchun (Jira)]

Yun Tang created FLINK-17808:
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             Summary: Rename checkpoint meta file to "_metadata" until it has completed writing
                 Key: FLINK-17808
                 URL: https://issues.apache.org/jira/browse/FLINK-17808
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Checkpointing
    Affects Versions: 1.10.0
            Reporter: Yun Tang
             Fix For: 1.12.0


In practice, some developers or customers would use some strategy to find the recent _metadata as the checkpoint to recover (e.g as many proposals in FLINK-9043 suggest). However, there existed a "_meatadata" file does not mean the checkpoint have been completed as the writing to create the "_meatadata" file could break as some force quit (e.g. yarn application -kill).

We could create the checkpoint meta stream to write data to file named as "_metadata.inprogress" and renamed it to "_metadata" once completed writing. By doing so, we could ensure the "_metadata" is not broken.



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