Till Rohrmann created FLINK-6526:
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Summary: BlobStore files might become orphans in case of recovery
Key: FLINK-6526
URL: https://issues.apache.org/jira/browse/FLINK-6526
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.3.0, 1.4.0
Reporter: Till Rohrmann
The {{BlobStore}} is used to store {{BlobServer}} files persistently if HA is
enabled. The {{BlobLibraryCacheManager}} is responsible for keeping track of a
reference count for each file. Once the count is {{0}} the
{{BlobLibraryCacheManager}} will eventually delete this file from the
{{BlobServer}} and also the {{BlobStore}}. In case of recovery, the
{{BlobLibraryCacheManager}} will only recover those files which are actively
asked for (e.g. jar files of new job submission or job recovery). All other
files which might have had a reference count of {{0}} and were supposed to be
eventually deleted, won't be reregistered on the {{BlobLibraryCacheManager}}.
Consequently, these files will never be deleted and remain on the BlobStore for
all eternity.
I think upon recovery, all files currently being held in the {{BlobStore}}
should be re-registered with the {{BlobLibraryCacheManager}} such that they
will be eventually deleted once they timed out with a reference count of {{0}}.
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