Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/254#issuecomment-66325909
The `IntermediateResultPartitionManager` is not safe. To make it safe
against concurrent shutdown calls, it needs to make the check for the shutdown
flag and the HashMap manipulation atomic. Here, it means it needs a proper
lock, not two individually atomic structures.
I think it does not hurt there, as it only happens once per partition at
startup and once at cleanup time.
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