[SPARK-55058][SS] Throw error on inconsistent checkpoint metadata #53844
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JIRA Issue Information=== Task SPARK-55058 === This comment was automatically generated by GitHub Actions |
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What changes were proposed in this pull request?
This PR will add validation when accessing the checkpoint to detect this inconsistent state and throw an error before the query can start with a new query ID.
Why are the changes needed?
When a streaming checkpoint directory has non-empty offset and commit logs but is missing the metadata file (containing the streaming query ID), the query will generate a new UUID on restart. This breaks the deduplication mechanism of exactly-once sinks like DeltaSink which relies on the streaming query ID to skip already-processed batches, leading to data duplication.
Does this PR introduce any user-facing change?
Yes. There is a new error condition MISSING_METADATA_FILE that occurs when a streaming checkpoint directory has non-empty offset and commit logs but is missing the metadata file.
How was this patch tested?
Unit tests and integration tests are added.
Was this patch authored or co-authored using generative AI tooling?
Used to assist in writing test suite.
Generated-by: Claude Sonnet 4.5