Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/3629#issuecomment-76369781
@andrewor14
If put it at the end of `accountingLock.synchronized`, as I described
above,
```
accountingLock.synchronized {
1. ensureFreeSpace() //here will call the currentUnrollMemory, it will
re-count the pendingUnrollmemmory to get freeMemory, then to judge whether free
space or not.
2. entries.put(blockId, entry)
}
```
If still need to put it at the end of `accountingLock.synchronized`, for
get free space in ensureFreeSpace.
may change the current code `val actualFreeMemory = freeMemory -
currentUnrollMemory` to `val actualFreeMemory = freeMemory -
currentUnrollMemory + unrollPendingMmeory(threadId)`
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