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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12990) Change default NameNode RPC port back to 8020
Date Wed, 07 Feb 2018 00:07:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354761#comment-16354761
] 

Xiao Chen commented on HDFS-12990:
----------------------------------

Thanks [~anu] for pushing this through the finish line, and all for chiming in.

> Change default NameNode RPC port back to 8020
> ---------------------------------------------
>
>                 Key: HDFS-12990
>                 URL: https://issues.apache.org/jira/browse/HDFS-12990
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>            Priority: Critical
>             Fix For: 3.0.1
>
>         Attachments: HDFS-12990.01.patch
>
>
> In HDFS-9427 (HDFS should not default to ephemeral ports), we changed all default ports
to ephemeral ports, which is very appreciated by admin. As part of that change, we also modified
the NN RPC port from the famous 8020 to 9820, to be closer to other ports changed there.
> With more integration going on, it appears that all the other ephemeral port changes
are fine, but the NN RPC port change is painful for downstream on migrating to Hadoop 3. Some
examples include:
> # Hive table locations pointing to hdfs://nn:port/dir
> # Downstream minicluster unit tests that assumed 8020
> # Oozie workflows / downstream scripts that used 8020
> This isn't a problem for HA URLs, since that does not include the port number. But considering
the downstream impact, instead of requiring all of them change their stuff, it would be a
way better experience to leave the NN port unchanged. This will benefit Hadoop 3 adoption
and ease unnecessary upgrade burdens.
> It is of course incompatible, but giving 3.0.0 is just out, IMO it worths to switch the
port back.



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