sahnib opened a new pull request, #45092:
URL: https://github.com/apache/spark/pull/45092
…
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### What changes were proposed in this pull request?
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This change cleans up any dangling files tracked as being previously
uploaded if they were cleaned up from the filesystem. The cleaning can happen
due to a compaction racing in parallel with commit, where compaction completes
after commit and a older version is loaded on the same executor.
### Why are the changes needed?
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The changes are needed to prevent RocksDB versionId mismatch errors (which
require users to clean the checkpoint directory and retry the query).
A particular scenario where this can happen is provided below:
1. Version V1 is loaded on executor A, RocksDB State Store has 195.sst,
196.sst, 197.sst and 198.sst files.
2. State changes are made, which result in creation of a new table file
200.sst.
3. State store is committed as version V2. The SST file 200.sst (as
000200-8c80161a-bc23-4e3b-b175-cffe38e427c7.sst) is uploaded to DFS, and
previous 4 files are reused. A new metadata file is created to track the exact
SST files with unique IDs, and uploaded with RocksDB Manifest as part of V1.zip.
4. Rocks DB compaction is triggered at the same time. The compaction creates
a new L1 file (201.sst), and deletes existing 5 SST files.
5. Spark Stage is retried.
6. Version V1 is reloaded on the same executor. The local files are
inspected, and 201.sst is deleted. The 4 SST files in version V1 are downloaded
again to local file system.
7. Any local files which are deleted (as part of version load) are also
removed from local → DFS file upload tracking. **However, the files already
deleted as a result of compaction are not removed from tracking. This is the
bug which resulted in the failure.**
8. State store is committed as version V1. However, the local mapping of SST
files to DFS file path still has 200.sst in its tracking, hence the SST file is
not re-uploaded. A new metadata file is created to track the exact SST files
with unique IDs, and uploaded with the new RocksDB Manifest as part of V2.zip.
(The V2.zip file is overwritten here atomically)
9. A new executor tried to load version V2. However, the SST files in (1)
are now incompatible with Manifest file in (6) resulting in the version Id
mismatch failure.
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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Added unit test cases to cover the scenario where some files were deleted on
the file system.
The test case fails with the existing master with error `Mismatch in unique
ID on table file 16`, and is successful with changes in this PR.
### Was this patch authored or co-authored using generative AI tooling?
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No
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