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https://issues.apache.org/jira/browse/FLINK-21992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arvid Heise resolved FLINK-21992.
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Resolution: Fixed
> Fix availability notification in UnionInputGate
> -----------------------------------------------
>
> Key: FLINK-21992
> URL: https://issues.apache.org/jira/browse/FLINK-21992
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.12.2, 1.13.0
> Reporter: Arvid Heise
> Assignee: Arvid Heise
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.13.0, 1.12.3
>
>
> A user on mailing list reported that his job gets stuck with unaligned
> checkpoint enabled.
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Source-Operators-Stuck-in-the-requestBufferBuilderBlocking-tt42530.html
> We received two similar reports in the past, but the users didn't follow up,
> so it was not as easy to diagnose as this time where the initial report
> already contains many relevant data points.
> Beside a buffer leak, there could also be an issue with priority notification.
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