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https://issues.apache.org/jira/browse/FLINK-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372719#comment-16372719
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Piotr Nowojski commented on FLINK-8737:
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First of all lets think whether we need this feature at all. If not, I would
drop it since that would be an extra dead-code to maintain. If it's simple, we
can always add it later when we need it.
> 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
> Priority: Major
> 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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