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https://issues.apache.org/jira/browse/FLINK-24182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17411008#comment-17411008
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Dawid Wysakowicz commented on FLINK-24182:
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I linked FLINK-23527 as I feel there are some overlaps between the
documentation part.
> Tasks canceler should not immediately interrupt
> -----------------------------------------------
>
> Key: FLINK-24182
> URL: https://issues.apache.org/jira/browse/FLINK-24182
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Task
> Reporter: Arvid Heise
> Priority: Major
>
> While debugging resource leaks (FLINK-24131), I found that any connector is
> immediately interrupted on cancel. Hence, any attempts of using blocking
> calls in {{close}} to cleanup resources are immediately unreliable (e.g.
> aborting transactions).
> It would be nice if tasks get a grace period (e.g.
> task.cancellation.interval) where they can try to free resources in a proper,
> potentially blocking fashion before being interrupted.
> Nevertheless, connectors should always expect interruptions during shutdown,
> in particular when the user-configurable grace period is depleted. I'd add
> that to the connector documentation in a separate effort.
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