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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5338) Add a conf to disable hostname check in DN registration
Date Thu, 10 Oct 2013 21:45:29 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HDFS-5338:
-----------------------------------------

    Description: 
During DN registration, if the ip and the hostname in the DN InetAddress are the same (i.e.
reverse name lookup falied; see [the javadoc|http://docs.oracle.com/javase/6/docs/api/java/net/InetAddress.html#getHostName%28%29]),
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.

  was:
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.


> 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
>         Attachments: h5338_20131009.patch
>
>
> During DN registration, if the ip and the hostname in the DN InetAddress are the same
(i.e. reverse name lookup falied; see [the javadoc|http://docs.oracle.com/javase/6/docs/api/java/net/InetAddress.html#getHostName%28%29]),
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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