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