Github user pzz2011 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9084#discussion_r75595379
  
    --- Diff: core/src/main/scala/org/apache/spark/memory/MemoryManager.scala 
---
    @@ -40,6 +41,10 @@ private[spark] abstract class MemoryManager {
         _memoryStore
       }
     
    +  // Amount of execution/storage memory in use, accesses must be 
synchronized on `this`
    +  protected var _executionMemoryUsed: Long = 0
    --- End diff --
    
    why here is protected?


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