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