Github user joewitt commented on the pull request:
https://github.com/apache/incubator-nifi/pull/51#issuecomment-116310453
> Good point. Maybe we can keep a thread-local cache of the sessions and
pass an accessor to the channel instead? Then we would be able to keep parallel
execution.
You'll want to find a mechanism other than thread local. There basically
zero guarantees on which thread you will get between 'onTrigger' calls. Now if
the processor takes a thread and doesn't return it to the controller you can
but that is pretty naughty.
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