sahnib opened a new pull request, #44837:
URL: https://github.com/apache/spark/pull/44837
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### What changes were proposed in this pull request?
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This PR ensures that RocksDB loads do not run into SST file Version ID
mismatch issue. RocksDB has added validation to ensure exact same SST file is
used during database load from snapshot. Current streaming state suffers from
certain edge cases where this condition is violated resulting in state load
failure.
The changes introduced are:
1. Ensure that the local SST file is exactly the same DFS file (as per
mapping in metadata.zip). We keep track of the DFS file path for a local SST
file, and re download the SST file in case DFS file has a different UUID in
metadata zip.
2. Reset lastSnapshotVersion in RocksDB when Rocks DB is loaded. Changelog
checkpoint relies on this version for future snapshots. Currently, if a older
version is reloaded we were not uploading snapshots as lastSnapshotVersion was
pointing to a higher snapshot of a cleanup database.
### Why are the changes needed?
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We need to ensure that the correct SST files are used on executor during
RocksDB load as per mapping in metadata.zip. With current implementation, its
possible that the executor uses a SST file (with a different UUID) from a older
version which is not the exact file mapped in the metadata.zip. This can cause
version Id mismatch errors while loading RocksDB leading to streaming query
failures.
See https://issues.apache.org/jira/browse/SPARK-46796 for failure scenarios.
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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Added exhaustive unit testcases covering the scenarios.
### Was this patch authored or co-authored using generative AI tooling?
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No
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