[jira] [Commented] (FLINK-2917) Make non-copying behaviour default for stream operator

["Robert Metzger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985052#comment-14985052 ] 

Robert Metzger commented on FLINK-2917:
---------------------------------------

[~aljoscha]: The switch is globally for the job, Gyula suggests to do it per-operator.

I agree with Gyula that we should change the default behavior for chained operators.

> Make non-copying behaviour default for stream operator
> ------------------------------------------------------
>
>                 Key: FLINK-2917
>                 URL: https://issues.apache.org/jira/browse/FLINK-2917
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Gyula Fora
>            Priority: Blocker
>
> Currently chained streaming operators copy their output before invoking the process method of the chained output task.
> The community has agreed that this might be too big of a price for the immutable semantics and the default behaviour should be changed to not copy.
> I suggest to have an api level switch for the Operators to enable copying. 



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