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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8372) normalizeHostName() in NetUtils is not working properly in resolving a hostname start with numeric character
Date Wed, 09 May 2012 15:27:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271482#comment-13271482
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Kihwal Lee commented on HADOOP-8372:
------------------------------------

{noformat}
A host name (label) MUST NOT consist of all numeric values.
{noformat}

They are invalid host names, so the tests need to be fixed. I suggest you keep the patch as
is and fix the broken tests.

If a user puts an invalid host name in config, it will fail eventually. If this method were
to return the string as is in such cases, it would get "translated" the same way somewhere
down the road. We could add a full validation and make it blow up in this method, but I don't
think the gain is worth the complexity of the check.

                
> 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: 1.0.0, 0.23.0
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HADOOP-8372.patch
>
>
> 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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