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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8156) Remove ability to specify a custom nameserver for an interface in DNS.java
Date Fri, 09 Mar 2012 00:11:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HADOOP-8156:
--------------------------------

    Attachment: hadoop-8156.txt

Patch attached. Depends on HADOOP-8154 and HADOOP-7806.
                
> Remove ability to specify a custom nameserver for an interface in DNS.java
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-8156
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8156
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-8156.txt
>
>
> A long time ago HADOOP-497 introduced the option to specify a specific nameserver to
use when looking up the hostname of an interface specified in the config (eg by {{dfs.datanode.dns.interface}}).
This feature is not in MR2, and I dont't think it makes sense for HDFS since HDFS stopped
advertising DNs by hostname a long time ago (HADOOP-985). Also per HADOOP-8134 and HBASE-4109,
I don't think this feature works, as it returns the PTR record verbatim instead of the hostname
(eg PTR record may have a trailing ".", ".lan" etc that may not resolve).
> How about we remove this feature from trunk and 23?   We can deprecate in 1.0, though
I doubt anyone is using it.  This is an incompatible change. DNS is annotated LimitedPrivate
and Unstable but HBase uses it so will file need to file a jira there (they use this via HBASE-1279
and HBASE-1279).

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