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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1977) Rework Stream Operators to always be push based
Date Fri, 15 May 2015 09:12:59 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14545196#comment-14545196
] 

ASF GitHub Bot commented on FLINK-1977:
---------------------------------------

Github user aljoscha commented on the pull request:

    https://github.com/apache/flink/pull/659#issuecomment-102333346
  
    Yes, I was aware of that new test. :smile: The PollingSourceFunction I didn't implement
because I think this is orthogonal to this work.
    
    For the operators, I think it's not a problem because I think they refer to different
concepts. The TwoInputOperator is a physical operator that happens to have two inputs. The
CoStreamMap is a higher level concept that implements a Map over two connected streams. And
it just so happens that this concept can be implemented using the "physical" two input operator.


> Rework Stream Operators to always be push based
> -----------------------------------------------
>
>                 Key: FLINK-1977
>                 URL: https://issues.apache.org/jira/browse/FLINK-1977
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> This is a result of the discussion on the mailing list. This is an excerpt from the mailing
list that gives the basic idea of the change:
> I propose to change all streaming operators to be push based, with a
> slightly improved interface: In addition to collect(), which I would
> call receiveElement() I would add receivePunctuation() and
> receiveBarrier(). The first operator in the chain would also get data
> from the outside invokable that reads from the input iterator and
> calls receiveElement() for the first operator in a chain.



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