[jira] Updated: (HADOOP-6682) NetUtils:normalizeHostName does not process hostnames starting with [a-f] correctly

["Jakob Homan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: HADOOP-6682-Y20.patch

Patch for Y20, which we forgot to upload at the time.  Not for commit.

> 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
>
>
>   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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