[jira] [Created] (FLINK-5908) Blob Cache can (rarely) get corrupted on failed blob downloads

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-5908:
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             Summary: Blob Cache can (rarely) get corrupted on failed blob downloads
                 Key: FLINK-5908
                 URL: https://issues.apache.org/jira/browse/FLINK-5908
             Project: Flink
          Issue Type: Bug
          Components: Distributed Coordination
    Affects Versions: 1.2.0
            Reporter: Stephan Ewen
             Fix For: 1.3.0, 1.2.1


The Blob Cache downloads files directly to the target file location.
While it tries to clean up failed attempts, there is a change that this cleanup does not complete.

In that case, we have a corrupt file at the target location. The blob cache then assumes that it already has the file cached already and future requests do not attempt to re-download the file.

The fix would be to download to a temp file name, validate the integrity, and rename to the target file path when the validation succeeds.

The validation for "content addressable" could even include validating the checksum hash.




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