Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/791#issuecomment-43842578
@tdas I think we shouldn't synchronize on this. When one thread is running
`ensureFreeSpace`, others should not get into `ensureFreeSpace`, but should be
able to add and remove blocks. So using a `putLock` is better.
About the test, I haven't but I'm going to. Can spark-perf do this?
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