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https://issues.apache.org/jira/browse/HADOOP-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054146#comment-13054146
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Eli Collins commented on HADOOP-6682:
-------------------------------------
The Y20 patch here is bogus btw it changes from 10 to 16 instead of vice versa.
Doesn't look like it was applied anywhere so not a big deal.
> 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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