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https://issues.apache.org/jira/browse/FLINK-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380634#comment-16380634
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ASF GitHub Bot commented on FLINK-8737:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/5583
> Creating a union of UnionGate instances will fail with
> UnsupportedOperationException when retrieving buffers
> ------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-8737
> URL: https://issues.apache.org/jira/browse/FLINK-8737
> Project: Flink
> Issue Type: Sub-task
> Components: Network
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Blocker
> Fix For: 1.5.0
>
>
> FLINK-8589 introduced a new polling method but did not implement
> {{UnionInputGate#pollNextBufferOrEvent()}}. This prevents UnionGate instances
> from containing a UnionGate instance which is explicitly allowed by its
> documentation and interface.
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