[SPARK-54307] [SS] Throw an error if streaming query is restarted with stateful op but there is empty state dir #53007
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liviazhu
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...e/src/main/scala/org/apache/spark/sql/execution/streaming/runtime/IncrementalExecution.scala
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… stateful op but there is empty state dir ### What changes were proposed in this pull request? Add an error if stateful operators are in the query plan but state directory is empty. ### Why are the changes needed? Without this explicit error, user will see CANNOT_LOAD_STATE_STORE.CANNOT_READ_STREAMING_STATE_FILE which is confusing and could be mistaken for an internal error. ### Does this PR introduce _any_ user-facing change? Yes, error message will change from `CANNOT_LOAD_STATE_STORE.CANNOT_READ_STREAMING_STATE_FILE` to `STREAMING_STATEFUL_OPERATOR_MISSING_STATE_DIRECTORY` ### How was this patch tested? New unit tests ### Was this patch authored or co-authored using generative AI tooling? Generated-by: Claude 4.5 Closes apache#53007 from liviazhu/liviazhu-db/empty-state-dir-error. Authored-by: Livia Zhu <livia.zhu@databricks.com> Signed-off-by: Anish Shrigondekar <anish.shrigondekar@databricks.com>
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What changes were proposed in this pull request?
Add an error if stateful operators are in the query plan but state directory is empty.
Why are the changes needed?
Without this explicit error, user will see CANNOT_LOAD_STATE_STORE.CANNOT_READ_STREAMING_STATE_FILE which is confusing and could be mistaken for an internal error.
Does this PR introduce any user-facing change?
Yes, error message will change from
CANNOT_LOAD_STATE_STORE.CANNOT_READ_STREAMING_STATE_FILEtoSTREAMING_STATEFUL_OPERATOR_MISSING_STATE_DIRECTORYHow was this patch tested?
New unit tests
Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude 4.5