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https://issues.apache.org/jira/browse/FLINK-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14208586#comment-14208586
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Fabian Hueske commented on FLINK-1238:
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+1 that would be very good!
> Add a way to deactivate the "mutable object safe mode"
> ------------------------------------------------------
>
> Key: FLINK-1238
> URL: https://issues.apache.org/jira/browse/FLINK-1238
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Affects Versions: 0.8-incubating
> Reporter: Stephan Ewen
> Priority: Minor
> Fix For: 0.8-incubating
>
>
> Currently, the runtime operators for Join and Cross operate in a safe mode
> concerning objects:
> Whenever a cross or join function is called with the same object more than
> once (for cross always, for join in all but the 1:1 join cases), the runtime
> makes deep copies of the objects before calling the join function.
> Even if the join function modifies the objects that were given into the
> function, the next call to the function will pass the original unmodified
> value. It is a safe mode for programmers that operate more in a Hadoop-ish
> way, were it was very common to modify the objects rather than creating new
> ones.
> I would add an option to disable that mode, as it does cost performance.
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