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https://issues.apache.org/jira/browse/FLINK-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-2646.
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Resolution: Staged
Closing this issue, as this has been inactive for long and there needs to be
solution to this as part of FLIP-147:
https://cwiki.apache.org/confluence/display/FLINK/FLIP-147%3A+Support+Checkpoints+After+Tasks+Finished
> User functions should be able to differentiate between successful close and
> erroneous close
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-2646
> URL: https://issues.apache.org/jira/browse/FLINK-2646
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 0.10.0
> Reporter: Stephan Ewen
> Priority: Major
> Labels: usability
>
> Right now, the {{close()}} method of rich functions is invoked in case of
> proper completion, and in case of canceling in case of error (to allow for
> cleanup).
> In certain cases, the user function needs to know why it is closed, whether
> the task completed in a regular fashion, or was canceled/failed.
> I suggest to add a method {{closeAfterFailure()}} to the {{RichFunction}}. By
> default, this method calls {{close()}}. The runtime is the changed to call
> {{close()}} as part of the regular execution and {{closeAfterFailure()}} in
> case of an irregular exit.
> Because by default all cases call {{close()}} the change would not be API
> breaking.
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