[jira] [Created] (FLINK-40779) JdbcSourceEnumerator snapshots splitter state ahead of the splits it has handled

["Martijn Visser (Jira)" <ji...@apache.org>]

Martijn Visser created FLINK-40779:
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             Summary: JdbcSourceEnumerator snapshots splitter state ahead of the splits it has handled
                 Key: FLINK-40779
                 URL: https://issues.apache.org/jira/browse/FLINK-40779
             Project: Flink
          Issue Type: Bug
          Components: Connectors / JDBC
    Affects Versions: jdbc-4.1.0
            Reporter: Martijn Visser


{{JdbcSourceEnumerator}} runs {{SplitterEnumerator#enumerateSplits}} through {{callAsync}}, so the splitter advances its state on the worker thread while the splits only reach {{unassigned}} once the handler runs on the coordinator thread. A checkpoint taken in between stores the new splitter state without those splits, and they are lost on restore. {{SqlTemplateSplitEnumerator}} in continuous mode is affected today.

{{snapshotState}} should use the splitter state that came back together with the last handled splits, captured inside the callable, instead of calling {{serializableState()}} directly.



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