zhijiang created FLINK-12474:
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Summary: 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
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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