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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