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https://issues.apache.org/jira/browse/IMPALA-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703905#comment-16703905
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Lars Volker commented on IMPALA-6194:
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Are I/O threads the only ones that can get stuck? The idea of the Jira was to
introduce a systematic way of ensuring that queries cannot get stuck, e.g. by
making it much harder to wait on a CV that doesn't get signaled during
cancellation. I'm in favor of tracking the general problem here.
> Ensure all fragment instances notice cancellation
> -------------------------------------------------
>
> Key: IMPALA-6194
> URL: https://issues.apache.org/jira/browse/IMPALA-6194
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Lars Volker
> Priority: Critical
> Labels: observability, supportability
>
> Currently queries can get stuck in an uncancellable state, e.g. when blocking
> on function calls or condition variables without periodically checking for
> cancellation. We should eliminate all those calls and make sure we don't
> re-introduce such issues. One option would be a watchdog to check that each
> fragment instance regularly calls RETURN_IF_CANCEL.
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