Github user jdye64 commented on the issue:
https://github.com/apache/nifi/pull/1595
My reasoning for adding the extra relationship was for end users to
understand that certain directories or files had improper permissions and have
a visible way to see that with the extra relationship. However your right we
could just add something like a "error.code" and "error.message" attributes and
route to failure. I would like the "error.code" for sure however since that
would be easy to route against while error.message might contain different
messages from the exceptions when dependency versions change
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