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

["Wilmer DAZA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958913#comment-14958913 ] 

Wilmer DAZA commented on FLINK-2151:
------------------------------------

Hello guys

I was wondering if there is already a plan to integrate Flink with Cassandra? (read/write tables, send queries en CQL, etc).

I am more interested in writing to cassandra tables from the Stream API of Flink, but i guess that an integration would require not just writing from DataStream but a whole complete connector with many other common functionalities

I am making this comment here because I'm guessing that maybe some work in such a connector may be already started.

Thank you

> 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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