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https://issues.apache.org/jira/browse/BEAM-7171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16829270#comment-16829270
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Thomas Weise commented on BEAM-7171:
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A possible solution is to replace the "finish bundle callback" with a "post
snapshot callback" and advance the watermark only then. No additional state
needs to be part of the snapshot, since the next watermark is certain to follow.
> New bundles may start within snapshotState
> ------------------------------------------
>
> Key: BEAM-7171
> URL: https://issues.apache.org/jira/browse/BEAM-7171
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.11.0
> Reporter: Thomas Weise
> Priority: Major
>
> The Flink runner finishes bundles as part of snapshotState. In the portable
> runner, it is possible that a new bundle will be started as part of finishing
> the bundle when the bundleFinishedCallback is invoked. This happens when the
> watermark advances and timers get fired.
>
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