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https://issues.apache.org/jira/browse/FLINK-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157910#comment-14157910
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Gyula Fora commented on FLINK-1137:
-----------------------------------
I think this is a good idea, we implemented something like this in the
streaming api.
You can call .setMutability(true) on the operators. But we still need to work
on it a little bit for some transformations.
> Add a way to switch between mutable object safe mode and efficient object
> reuse mode
> ------------------------------------------------------------------------------------
>
> Key: FLINK-1137
> URL: https://issues.apache.org/jira/browse/FLINK-1137
> Project: Flink
> Issue Type: Improvement
> Reporter: Stephan Ewen
> Priority: Minor
>
> Right now, Flink is conservative and takes precautions with respect to
> mutable objects. Neither the modifying of objects that are input to UDFs, nor
> modifying objects that are returned, will cause wrong results.
> This incurs a certain overhead for some operators. Most operators have a way
> to avoid that.
> I propose an optional switch to allow to set the system to a mode where it
> avoids those precautions, for the sake of efficiency.
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