Github user tasanuma commented on the issue:
https://github.com/apache/nifi/pull/2582
Thanks for working on this task.
Basically, Wire Protocols between Hadoop clients and servers can be broken
if they aren't within a major version. I think we should carefully proceed.
FYI:
http://hadoop.apache.org/docs/r3.1.0/hadoop-project-dist/hadoop-common/Compatibility.html#Wire_Protocols
https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+3.0.0+Release---
