Github user rdblue commented on the pull request:
https://github.com/apache/incubator-nifi/pull/51#issuecomment-116823666
I think thread-local would be okay because the thread doesn't change while
the process is running. In onTrigger, you would first set the thread's session,
then call the Flume processor that pulls from the channel by accessing the
session for its thread.
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