Junping Du created HADOOP-8372:
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Summary: normalizeHostName() in NetUtils is not working properly
in resolving a hostname start with numeric character
Key: HADOOP-8372
URL: https://issues.apache.org/jira/browse/HADOOP-8372
Project: Hadoop Common
Issue Type: Bug
Components: io, util
Affects Versions: 0.23.0, 1.0.0
Reporter: Junping Du
Assignee: Junping Du
A valid host name can start with numeric value (You can refer RFC952, RFC1123
or http://www.zytrax.com/books/dns/apa/names.html), so it is possible in a
production environment, user name their hadoop nodes as: 1hosta, 2hostb, etc.
But normalizeHostName() will recognise this hostname as IP address and return
directly rather than resolving the real IP address. These nodes will be failed
to get correct network topology if topology script/TableMapping only contains
their IPs (without hostname).
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