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

    https://github.com/apache/spark/pull/14553#discussion_r79492259
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
 ---
    @@ -72,13 +74,17 @@ class StreamExecution(
       /**
        * Tracks how much data we have processed and committed to the sink or 
state store from each
        * input source.
    +   * Only the scheduler thread should modify this field, and only in 
atomic steps. Other threads
    +   * must create a local copy before iterating over this data structure.
    --- End diff --
    
    I agree with the first sentance.  I'm not sure I understand the second.


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