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https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532728#comment-14532728
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ASF GitHub Bot commented on FLINK-1977:
---------------------------------------

Github user mbalassi commented on the pull request:

    https://github.com/apache/flink/pull/659#issuecomment-99885222
  
    General comments:
    
      * Let us make sure that the names are somewhat consistent with other 
parts of the code. Made inline comments.
      * Low watermark concept is "sneaked" into the source interfaces without 
mentioning it in the description. :)
      * You use `joda.time` which is inconsistent with other parts of the 
streaming code. Let us avoid using two time packages.
      * These changes need documentation, the source behavior is completely 
changed.


> 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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