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Date: Sat, 12 Jun 2010 07:22:15 -0400 (EDT)
From: "Hudson (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6682) NetUtils:normalizeHostName does not
 process hostnames starting with [a-f] correctly
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    [ https://issues.apache.org/jira/browse/HADOOP-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878252#action_12878252 ] 

Hudson commented on HADOOP-6682:
--------------------------------

Integrated in Hadoop-Common-trunk #364 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Common-trunk/364/])
    HADOOP-6682. NetUtils:normalizeHostName does not process hostnames starting with [a-f] correctly.


> NetUtils:normalizeHostName does not process hostnames starting with [a-f] correctly
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-6682
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6682
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>            Reporter: Jakob Homan
>            Assignee: Jakob Homan
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-6682-Y20.patch, HADOOP-6682.patch
>
>
>   public static String normalizeHostName(String name) {
>     if (Character.digit(name.charAt(0), 16) != -1) {
>       return name;
> This code is attempting to short-circuit the hostname->ip resolution on the assumption that if name starts with a digit, it's already an ip address.  This is of questionable value, but because it checks for a hex digit, it will fail on names starting with [a-f].  Such names will not be converted to an ip address, but be returned unchanged.

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