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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 Wed, 06 Mar 2013 07:50:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594470#comment-13594470
] 

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

Hi Karthik, the patch seems fine to me, and I agree that the patch is so simple and writing
a test sufficiently difficult that it seems unnecessary to write a test for this.

One question - can you comment on the ramifications of this issue? How does it manifest itself?
And what triggers it?
                
> 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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