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https://issues.apache.org/jira/browse/HDFS-14327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16810148#comment-16810148
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Íñigo Goiri commented on HDFS-14327:
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[~fengnanli], it looks like now we are having errors in the HDFS configs:
https://builds.apache.org/job/PreCommit-HADOOP-Build/16118/testReport/
hdfs-default.xml has 1 properties missing in interface
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys interface
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys$Failover interface
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys$StripedRead class
org.apache.hadoop.hdfs.DFSConfigKeys interface
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys$BlockWrite interface
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys$BlockWrite$ReplaceDatanodeOnFailure
Entries: dfs.client.failover.resolver.useFQDN expected:<0> but was:<1>
I'll open a JIRA to follow up.
> 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
> Fix For: 3.3.0
>
> Attachments: HDFS-14327.001.patch, HDFS-14327.002.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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