[jira] [Created] (HDFS-12990) Change default NameNode RPC port back to 8020

["Xiao Chen (JIRA)" <ji...@apache.org>]

Xiao Chen created HDFS-12990:
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             Summary: 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
    Affects Versions: 3.0.0
            Reporter: Xiao Chen
            Assignee: Xiao Chen
            Priority: Critical


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.



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