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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