[jira] [Updated] (FLINK-2646) User functions should be able to differentiate between successful close and erroneous close

["Aljoscha Krettek (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-2646:
------------------------------------
    Labels: usability  (was: )

> 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
>            Assignee: Kostas Kloudas
>            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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