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https://issues.apache.org/jira/browse/FLINK-20649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253554#comment-17253554
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Kezhu Wang commented on FLINK-20649:
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Should this be problem of {{CustomTableSourceFunctionBase.close}} ? If you
think it is not, what if {{CustomMapFunction.map}} stuck ?
> StreamTask closeAllOperators stuck
> ----------------------------------
>
> Key: FLINK-20649
> URL: https://issues.apache.org/jira/browse/FLINK-20649
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.12.0
> Reporter: weiyunqing
> Priority: Major
> Attachments: image-2020-12-17-17-57-41-680.png
>
>
> When a StreamTask exits due to an internal exception, the StreamTask does not
> use an asynchronous thread to closeAllOperators or set a timeout. The
> StreamTask will be stuck here (no upstream and downstream scenarios)
> !image-2020-12-17-17-57-41-680.png!
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