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


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