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Posted to dev@flink.apache.org by "Dawid Wysakowicz (Jira)" <ji...@apache.org> on 2021/12/10 10:53:00 UTC

[jira] [Created] (FLINK-25256) Savepoints do not work with ExternallyInducedSources

Dawid Wysakowicz created FLINK-25256:
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             Summary: Savepoints do not work with ExternallyInducedSources
                 Key: FLINK-25256
                 URL: https://issues.apache.org/jira/browse/FLINK-25256
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
    Affects Versions: 1.13.3, 1.14.0
            Reporter: Dawid Wysakowicz


It is not possible to take a proper savepoint with {{ExternallyInducedSource}} or {{ExternallyInducedSourceReader}}. The problem is that we're hardcoding {{CheckpointOptions}} in the {{triggerHook}}.

The outcome of current state is that operators would try to take checkpoints in the checkpoint location whereas the {{CheckpointCoordinator}} will write metadata for those states in the savepoint location.

Moreover the situation gets even weirder (I have not checked it entirely), if we have a mixture of {{ExternallyInducedSource(s)}} and regular sources. In such a case the location and format at which the state of a particular task is persisted depends on the order of barriers arrival. If a barrier from a regular source arrives last the task takes a savepoint, on the other hand if last barrier is from an externally induced source it will take a checkpoint.



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