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Date: Thu, 10 Oct 2013 01:53:42 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-5338) Add a conf to disable hostname check
 in DN registration
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Tsz Wo (Nicholas), SZE created HDFS-5338:
--------------------------------------------

             Summary: Add a conf to disable hostname check in DN registration
                 Key: HDFS-5338
                 URL: https://issues.apache.org/jira/browse/HDFS-5338
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
            Reporter: Tsz Wo (Nicholas), SZE
            Assignee: Tsz Wo (Nicholas), SZE


During DN registration, if the ip and the hostname in the DN InetAddress are different, the DN will be disallowed to register, where the DN InetAddress was obtained from the socket.  It is a performance improvement added by HDFS-3990 to avoid unnecessary DNS resolutions.

We propose to add a conf property for disabling the check.  Otherwise, clusters without reverse DNS lookup support does not work.


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