Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/1958
@mattyb149 I did realize that after setting mime.type we were overwriting
it with the mime.type attribute of incoming FlowFiles. Sorry about that. I also
found and fixed a threading issue in the RecordBinManager and improved the
documentation around the Processor. I have pushed another commit that handles
all of this. Please give it another review if you are able.
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