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https://issues.apache.org/jira/browse/NIFI-4923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433714#comment-16433714
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ASF GitHub Bot commented on NIFI-4923:
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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


> Upgrade nifi-hadoop-libraries-nar hadoop-client version dependency to 3.0.0
> ---------------------------------------------------------------------------
>
>                 Key: NIFI-4923
>                 URL: https://issues.apache.org/jira/browse/NIFI-4923
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Jeff Storck
>            Assignee: Jeff Storck
>            Priority: Major
>
> Update the hadoop-client dependency to 3.0.0 in nifi-hadoop-libraries-nar, 
> and hadoop-utils.  Also, add explicit (provided) dependency on 
> hadoop-hdfs-client to nifi-hdfs-processors.



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