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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8372) normalizeHostName() in NetUtils is not working properly in resolving a hostname start with numeric character
Date Wed, 09 May 2012 11:57:53 GMT
Junping Du created HADOOP-8372:
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             Summary: normalizeHostName() in NetUtils is not working properly in resolving
a hostname start with numeric character
                 Key: HADOOP-8372
                 URL: https://issues.apache.org/jira/browse/HADOOP-8372
             Project: Hadoop Common
          Issue Type: Bug
          Components: io, util
    Affects Versions: 0.23.0, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du


A valid host name can start with numeric value (You can refer RFC952, RFC1123 or http://www.zytrax.com/books/dns/apa/names.html),
so it is possible in a production environment, user name their hadoop nodes as: 1hosta, 2hostb,
etc. But normalizeHostName() will recognise this hostname as IP address and return directly
rather than resolving the real IP address. These nodes will be failed to get correct network
topology if topology script/TableMapping only contains their IPs (without hostname).

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