Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/3302#issuecomment-63407717
Basically it is weird to have a var shared with subclasses, but I think
this will be more obvious. Probably the very best way is to make elementsRead
be modified only in Spillable, and add a method called addElementRead or
something like that subclasses can call to tell it to increment the count.
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