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https://issues.apache.org/jira/browse/FLINK-12474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhijiang closed FLINK-12474.
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Resolution: Invalid
> UnionInputGate should be notified when closing SingleInputGate by canceler
> thread
> ---------------------------------------------------------------------------------
>
> Key: FLINK-12474
> URL: https://issues.apache.org/jira/browse/FLINK-12474
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Network
> Reporter: zhijiang
> Priority: Minor
>
> If task is being canceled, the `SingleInputGate` would be closed by canceler
> thread. If the `SingleInputGate` is waiting for buffer,
> `inputChannelWithData` would be notified to wake task thread to exit early.
> But if the `UnionInputGate` is waiting for buffer, task thread is still
> stucking in wait when `SingleInputGate` is closed until cancel timeout.
> To make task exit early in this case, we could make `SingleInputGate` further
> notify `UnionInputGate` after it is closed, then it could also wake task
> thread to exit during canceling.
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