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Date: Fri, 11 Jun 2010 21:12:14 -0400 (EDT)
From: "Jakob Homan (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Updated: (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:all-tabpanel ]

Jakob Homan updated HADOOP-6682:
--------------------------------

    Status: Open  (was: Patch Available)

I call bogus on the javadoc warning, since this patch doesn't affect that.  Re-run Hudson for test failure.  I don't see it on my machine, but let's see if it re-occurs.

> 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
>         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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