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https://issues.apache.org/jira/browse/FLINK-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533220#comment-14533220
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ASF GitHub Bot commented on FLINK-1977:
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Github user mbalassi commented on the pull request:
https://github.com/apache/flink/pull/659#issuecomment-99984916
@aljoscha I think we have two options:
* Those sources with return constant false in reachedEnd() and killed
externally when the user desires to do so.
* They do data-driven close, where the next() can set reachedEnd() true
upon a trigger.
Storm has an interface similar to this and seems to work. :) Task killing
is quite graceful there however, we need to be more careful there then.
> 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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