Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/1109
Looks like lots of debug level logging was added around the wait/notify of
the monitor used to lock during requests. However, in the case there was a
dissenting node in phase one of a two phase mutable request there is not
logging around the notify.
Additionally, it looks like when any node fails the onCompletion callback
is invoked immediately which triggers the notify signaling all requests have
completed when that is not the case.
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