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https://issues.apache.org/jira/browse/FLINK-18906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249428#comment-17249428
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Xintong Song commented on FLINK-18906:
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True, thank you [~pnowojski].
> Support checkpointing with multiple input operator chained with sources
> -----------------------------------------------------------------------
>
> Key: FLINK-18906
> URL: https://issues.apache.org/jira/browse/FLINK-18906
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Checkpointing, Runtime / Task
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> Generalize `CheckpointBarrierHandlers` plus hook in sources to
> `CheckpointBarrierHandlers`.
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