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https://issues.apache.org/jira/browse/HDFS-12990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322838#comment-16322838
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Chris Douglas commented on HDFS-12990:
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bq. No incompatible changes are allowed between 3.0.0 and 3.0.1. Dot releases
only allow bug fixes. Won't you agree?
Not to get too bogged down in semantics, but changing the NN port from 8020 to
9820 breaks downstream users for no benefit. We require some technical
justification for breaking compatibility. If the new port were part of the
contiguous range, or if the original port was in the ephemeral range, then
arguments in favor of retaining this change would have technical merit. As this
change lacks any justification, the original change was not a valid,
incompatible change; it *is* a bug.
Semantics aside, as [~daryn] pointed out on the dev list, this broke rolling
upgrades. It broke applications. It broke deployments. We don't have to burn a
major version to fix it, so let's just... fix it.
> 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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