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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6682) NetUtils:normalizeHostName does not process hostnames starting with [a-f] correctly
Date Tue, 06 Apr 2010 04:44:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853740#action_12853740
] 

Hong Tang commented on HADOOP-6682:
-----------------------------------

The regex IPV4BKN needs some change because in job history dots (.) are escaped with double
backslashes.

> 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
>
>   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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