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

["Dawid Wysakowicz (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-25256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499438#comment-17499438 ] 

Dawid Wysakowicz commented on FLINK-25256:
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Externally induced sources are quite limited atm. How important is the feature for Pravega connector? See also https://issues.apache.org/jira/browse/FLINK-26392 As far as I know it is the only one that has ever used it. cc [~Brian Zhou] [~jqin]

> 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: 1.14.0, 1.13.3
>            Reporter: Dawid Wysakowicz
>            Assignee: Dawid Wysakowicz
>            Priority: Major
>
> It is not possible to take a proper savepoint with {{ExternallyInducedSource}} or {{ExternallyInducedSourceReader}} (both legacy and FLIP-27 versions). 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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