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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9369) DNS#reverseDns() can return hostname with . appended at the end
Date Thu, 07 Mar 2013 23:48:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596575#comment-13596575
] 

Aaron T. Myers commented on HADOOP-9369:
----------------------------------------

Thanks a lot for the explanation, Karthik. Makes sense, and the patch seems quite straightforward.

+1, I'm going to commit this momentarily.
                
> DNS#reverseDns() can return hostname with . appended at the end
> ---------------------------------------------------------------
>
>                 Key: HADOOP-9369
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9369
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: net
>    Affects Versions: 1.1.1, 2.0.3-alpha, 0.23.5
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: hadoop-9369-branch1.patch, hadoop-9369.patch, hadoop-9369.patch
>
>
> DNS#reverseDns uses javax.naming.InitialDirContext to do a reverse DNS lookup. This can
sometimes return hostnames with a . at the end.
> Saw this happen on hadoop-1: two nodes with tasktracker.dns.interface set to eth0

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