Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2448
@mattyb149 there you go.
Also, I started applying the two session approach
[here](https://github.com/MikeThomsen/nifi/tree/split-proc), but I'm not sure
about my approach because I had to start modifiying StandardProcessSession.---
