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https://issues.apache.org/jira/browse/HDFS-10391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412601#comment-15412601
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Arpit Agarwal commented on HDFS-10391:
--------------------------------------

It's complicated to do this in a backwards-compatible manner. Instead just 
retargeting it for 3.x as an incompatible change.

> Always enable NameNode service RPC port
> ---------------------------------------
>
>                 Key: HDFS-10391
>                 URL: https://issues.apache.org/jira/browse/HDFS-10391
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, namenode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>              Labels: Incompatible
>
> The NameNode should always be setup with a service RPC port so that it does 
> not have to be explicitly enabled by an administrator.



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