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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4043) Namenode Kerberos Login does not use proper hostname for host qualified hdfs principal name.
Date Fri, 19 Oct 2012 11:06:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479954#comment-13479954

Brahma Reddy Battula commented on HDFS-4043:


Let's go ahead and close this JIRA.
You are right however, that your problems are a manifestation of the same general bug (inconsistent
resolution of canonical principal name via different code paths). Most definitely, incoming
IP based connections need to use getCanonicalName to get back a host name that can be used
to form the proper principal name. Otherwise you will need to probably go with IP based principal
names ?
can we discuss this point in HDF-3980..?
> Namenode Kerberos Login does not use proper hostname for host qualified hdfs principal
> --------------------------------------------------------------------------------------------
>                 Key: HDFS-4043
>                 URL: https://issues.apache.org/jira/browse/HDFS-4043
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.0.0-alpha, 2.0.1-alpha, 2.0.2-alpha, 2.0.3-alpha
>         Environment: CDH4U1 on Ubuntu 12.04
>            Reporter: Ahad Rana
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> The Namenode uses the loginAsNameNodeUser method in NameNode.java to login using the
hdfs principal. This method in turn invokes SecurityUtil.login with a hostname (last parameter)
obtained via a call to InetAddress.getHostName. This call does not always return the fully
qualified host name, and thus causes the namenode to login to fail due to kerberos's inability
to find a matching hdfs principal in the hdfs.keytab file. Instead it should use InetAddress.getCanonicalHostName.
This is consistent with what is used internally by SecurityUtil.java to login in other services,
such as the DataNode. 

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