Github user jdye64 commented on the issue:
https://github.com/apache/nifi/pull/1372
@ddewaele The plan is to certainly add volumes. For this first pass however
we might not add it just to get things like infrastructure ironed out and
simple. It should be really easy to add volumes in our next iteration, which
doesn't even necessarily have to wait until the next release.
As for the custom processors you could still extend this Apache image the
same way you are doing today and add your custom processors. The official image
will only contain the base processors however.
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