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https://issues.apache.org/jira/browse/HDFS-12990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328025#comment-16328025
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Chris Douglas commented on HDFS-12990:
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[~eyang], that paragraph begs the question. Paraphrasing: "we must retain the
change, because we can only work around the consequences." In every example you
cite, the project and users got some benefit. Reverting this change _is_ an
admissible solution to fix the bugs it caused.
Our releases solve problems for our users. We're not here to curate a version
control system and a set of compatibility rules.
> 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
> 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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