[jira] [Created] (FLINK-2151) Provide interface to distinguish close() calls in error and regular cases

[Shang Yuanchun (Jira)]

Robert Metzger created FLINK-2151:
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             Summary: Provide interface to distinguish close() calls in error and regular cases
                 Key: FLINK-2151
                 URL: https://issues.apache.org/jira/browse/FLINK-2151
             Project: Flink
          Issue Type: Improvement
          Components: Local Runtime
    Affects Versions: 0.9
            Reporter: Robert Metzger


I was talking to somebody who is interested in contributing a {{flink-cassandra}} connector.

The connector will create cassandra files locally (on the TaskManagers) and bulk-load them in the {{close()}} method.
For the user functions it is currently not possible to find out whether the function is closed due to an error or an regular end.

The simplest approach would be passing an additional argument (enum or boolean) into the close() method, indicating the type of closing.
But that would break all existing code.

Another approach would add an interface that has such an extended close method {{RichCloseFunction}}.



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