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https://issues.apache.org/jira/browse/FLINK-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora closed FLINK-2917.
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Resolution: Won't Fix
> 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: API / DataStream
> Reporter: Gyula Fora
> Priority: Major
>
> 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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