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https://issues.apache.org/jira/browse/FLINK-13013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873978#comment-16873978
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Piotr Nowojski commented on FLINK-13013:
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As a hotfix we are attempting to always wake up
{{SingleInputGate#isAvailable()}} upon creation/registration of an
{{InputChannel}}, so that {{requestPartitions()}} can happen.
For a long term solution, life cycle of the partitions/input channels/input
gate might need to be changed.
> Make sure that SingleInputGate can always request partitions
> ------------------------------------------------------------
>
> Key: FLINK-13013
> URL: https://issues.apache.org/jira/browse/FLINK-13013
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Network
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
>
> Currently {{SingleInputGate}} requests partitions only on the first attempt
> to fetch the data. Before requesting partitions, no data availability
> notifications can get through. This doesn't work well with a new non blocking
> {{InputGate}} interface, since on newly created {{SingleInputGates,}}
> {{InputGate#isAvailable()}} might return not available, and it will be only
> able to switch to available, after first call to
> {{SingleInputGate#pollNext()}}.
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