[jira] [Created] (FLINK-25403) Make BlobServer/BlobCache compatible with local working directories

["Till Rohrmann (Jira)" <ji...@apache.org>]

Till Rohrmann created FLINK-25403:
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             Summary: Make BlobServer/BlobCache compatible with local working directories
                 Key: FLINK-25403
                 URL: https://issues.apache.org/jira/browse/FLINK-25403
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.15.0
            Reporter: Till Rohrmann
             Fix For: 1.15.0


With [FLIP-198|https://cwiki.apache.org/confluence/x/ZZiqCw] Flink processes can now have a working directory that they use to store "semi-persistent" information. The stored blobs by the {{BlobServer}} and the {{BlobCache}} can be candidates for such a storage because in case of a recovery we might not have to re-download them.

In order to make the {{BlobServer}} and {{BlobCache}} work together with the local working directories, they have be able to detect corrupted blobs (e.g. due to process crashes when downloading blobs) and delete them. Therefore, I propose to let the {{BlobServer}} and {{BlobCache}} remember which blobs they have verified (by recomputing their checksums) and to delete those that did not pass.



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