Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/392#issuecomment-74367347
The problem here I think that an error caused by the reusing mapper could
be very hard to detect. So some users might have it but they don't realise.
For streaming we copy the input at every chained function call just to be
on the safe side, but we'll have to reintroduce the object reuse mode.
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