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Posted to common-dev@hadoop.apache.org by "Jakob Homan (JIRA)" <ji...@apache.org> on 2010/04/06 01:54:27 UTC

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

NetUtils:normalizeHostName does not process hostnames starting with [a-f] correctly
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                 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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