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From "Hadoop QA (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 18:41:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271680#comment-13271680
] 

Hadoop QA commented on HADOOP-8372:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12526188/HADOOP-8372-v3.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified test files.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/969//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/969//console

This message is automatically generated.
                
> 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-v2.patch, HADOOP-8372-v3.patch, 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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