Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1115#issuecomment-139558118
Stephan, while looking for the `UnionWithTempOperator` bug elsewhere, I
noticed that `AllReduceDriver.run()`, `ReduceDriver.run()`, and
`ReduceCombinerDriver.sortAndCombine()` locally create new objects before every
call to `MutableObjectIterator.next(T)`. This looks to be double allocating new
objects in the case that the `TypeSerializer` does not support object reuse.
Also, `ReduceCombinerDriver.sortAndCombine.run()` is not switching on
`objectReuseEnabled`.
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