[jira] [Created] (FLINK-2646) Rich functions should provide a method "closeAfterFailure()"

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-2646:
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             Summary: Rich functions should provide a method "closeAfterFailure()"
                 Key: FLINK-2646
                 URL: https://issues.apache.org/jira/browse/FLINK-2646
             Project: Flink
          Issue Type: Improvement
          Components: Core
    Affects Versions: 0.10
            Reporter: Stephan Ewen
             Fix For: 0.10


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 {{RuchFunction}}. 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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