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From "Eli Collins (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8156) Remove ability to specify a custom nameserver for an interface in DNS.java
Date Thu, 08 Mar 2012 23:29:58 GMT
Remove ability to specify a custom nameserver for an interface in DNS.java
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                 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


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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