Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/5868#issuecomment-101067908
@JoshRosen could you elaborate why you need to use `synchronized` in
`TaskMemoryManager`? It;s weird that only `allocatedPages` is protected by
`synchronized`. I think `TaskMemoryManager` won't be accessed by multiple
threads. Right?
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