Github user HeartSaVioR commented on the issue:
https://github.com/apache/spark/pull/21500
Retaining versions of state is also relevant to do snapshotting the last
version in files: HDFSBackedStateStoreProvider doesn't snapshot if the version
doesn't exist in loadedMaps. So we may want to check whether this option also
works with current approach of snapshotting.
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