[jira] [Updated] (FLINK-41010) [cdc-base] NPE in HybridSplitAssigner.createStreamSplit when failed snapshot splits are re-added after assigner finished

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-41010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-41010:
-----------------------------------
    Labels: pull-request-available  (was: )

> [cdc-base] NPE in HybridSplitAssigner.createStreamSplit when failed snapshot splits are re-added after assigner finished
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-41010
>                 URL: https://issues.apache.org/jira/browse/FLINK-41010
>             Project: Flink
>          Issue Type: Bug
>          Components: Flink CDC
>    Affects Versions: cdc-3.6.0, cdc-3.7.0
>            Reporter: tchivs
>            Priority: Major
>              Labels: pull-request-available
>
> FLINK-40052 reports this for MySQL. The incremental snapshot framework in flink-cdc-base (used by Postgres, Oracle, SQL Server, Db2) has the same defect, and the open PR for FLINK-40052 only changes the MySQL assigner.
> With parallelism 1, {{SnapshotSplitAssigner#onFinishedSplits}} moves the status to {{INITIAL_ASSIGNING_FINISHED}} as soon as the last split reports. If the reader then fails and the split comes back through {{addSplits}}, the status is not rolled back, {{noMoreSplits()}} returns true, and {{HybridSplitAssigner#createStreamSplit}} dereferences the missing finished offset ({{HybridSplitAssigner.java:316}} on master). The state is checkpointed, so restarting the job hits the same NPE.
> Suggested fix: in {{SnapshotSplitAssigner#addSplits}}, roll {{INITIAL_ASSIGNING_FINISHED}} back to {{INITIAL_ASSIGNING}} (and {{NEWLY_ADDED_ASSIGNING_SNAPSHOT_FINISHED}} back to {{NEWLY_ADDED_ASSIGNING}}) and clear {{checkpointIdToFinish}}, mirroring the MySQL fix.



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