Github user suyanNone commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3629#discussion_r25421661
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/MemoryStore.scala ---
    @@ -328,6 +330,7 @@ private[spark] class MemoryStore(blockManager: 
BlockManager, maxMemory: Long)
         val droppedBlocks = new ArrayBuffer[(BlockId, BlockStatus)]
     
         accountingLock.synchronized {
    +      releasePendingUnrollMemoryForThisThread()
    --- End diff --
    
    @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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