[jira] [Created] (FLINK-7261) avoid unnecessary exceptions in the logs in non-HA cases

[Shang Yuanchun (Jira)]

Nico Kruber created FLINK-7261:
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             Summary: avoid unnecessary exceptions in the logs in non-HA cases
                 Key: FLINK-7261
                 URL: https://issues.apache.org/jira/browse/FLINK-7261
             Project: Flink
          Issue Type: Sub-task
          Components: Distributed Coordination, Network
    Affects Versions: 1.4.0
            Reporter: Nico Kruber
            Assignee: Nico Kruber


{{PermanentBlobCache#getHAFileInternal}} first tries to download files from the HA store but if it does not exist, it will log an exception from the attempt to move the {{incomingFile}} to its destination which is misleading to the user.

We should extend {{BlobView#get}} to return whether a file was actually copied or not, e.g. in the {{VoidBlobStore}} to keep the abstraction of the BLOB stores but to not report errors in expected cases (recall that {{FileSystemBlobStore#get}} will already throw an exception if anything failed in there and if successful but the succeeding move fails the exception from the move should still be prevailed).



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