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https://issues.apache.org/jira/browse/HDFS-14327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16796423#comment-16796423
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Fengnan Li commented on HDFS-14327:
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[~elgoiri] thanks for bringing those to my attention.
>From the first peek I feel like those two issue YARN-9399 and HDFS-4957 are
>not overlapping with this task since this one doesn't deal with the stale IP
>as well so I probably won't cover those in this ticket. However, I can work on
>the other two (I think solving one might solve the other as well) after this
>one is done.
> Using FQDN instead of IP to access servers with DNS resolving
> -------------------------------------------------------------
>
> Key: HDFS-14327
> URL: https://issues.apache.org/jira/browse/HDFS-14327
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Major
> Attachments: HDFS-14327.001.patch
>
>
> With [HDFS-14118|https://issues.apache.org/jira/browse/HDFS-14118], clients
> can get the IP of the servers (NN/Routers) and use the IP addresses to access
> the machine. This will fail in secure environment as Kerberos is using the
> domain name (FQDN) in the principal so it won't recognize the IP addresses.
> This task is mainly adding a reverse look up on the current basis and get the
> domain name after the IP is fetched. After that clients will still use the
> domain name to access the servers.
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