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Date: Wed, 7 Feb 2007 08:52:05 -0800 (PST)
From: "Andrew McNabb (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-685) DataNode appears to require DNS name
 resolution as opposed to direct ip mapping
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    [ https://issues.apache.org/jira/browse/HADOOP-685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12471026 ] 

Andrew McNabb commented on HADOOP-685:
--------------------------------------

I agree with Marco.  When machines have multiple interfaces, automatic resolution of hostnames always seems to be problematic.

> DataNode appears to require DNS name resolution as opposed to direct ip mapping
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-685
>                 URL: https://issues.apache.org/jira/browse/HADOOP-685
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>         Environment: osx, ubuntu 6.10b
>            Reporter: James Todd
>         Assigned To: Raghu Angadi
>            Priority: Minor
>
> DataNode appears to require DNS resolution of nodes via the class org.apache.hadoop.net.DNS as opposed being able to use a specified ip.
> as an example, i was not able to set up more then one instance of dfs datanodes on one box using loopback w/ varying ports since DataNode
> resolved the ip of 127.0.0.1 to be "foo.bar" which was then mapped to the dhcp allocated ip of 192.168.0.***, which was not addressable by the
> rest of the dfs cluster (namely namenode).
> while this example is trivial one should be able to use the very same process yet change only the ip's of the nodes and have things work as
> expected.
> it would be nice to not always require nds resolution.

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