Github user olegz commented on the pull request:
https://github.com/apache/nifi/pull/354#issuecomment-211718256
@joewitt As I am thinking more about it, you have a point for @OnStopped,
so I am retracting my comment. As for volatile, what's at question is the
visibility of the _transformer_ by another thread. Basically if T1 executed
@OnSchedule where it is set to a value, T2 may come in and it will still be
null, not because of some race condition, but simply because the value set by
T1 may not be visible by T2.
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