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https://issues.apache.org/jira/browse/HADOOP-7423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054241#comment-13054241
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Joep Rottinghuis commented on HADOOP-7423:
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Isn't it true that even with IP addresses used in the topology script, one
still has to make sure that Hostname=>IP=>Hostname is always consistent?
We had a situation where some nodes were inserted in each rack all and the
numeric part of the names of the data nodes shifted by a few numbers (the
domain also changed slighty). Even though the IP addresses stayed the same, for
some of the nodes an nslookup resulted in multiple entries. We got some weird
behavior.
In a brief glance through the code there seem to be several places where IP is
mapped to name and name is mapped to IP, or am I wrong in this?
> Document topology script requirements
> -------------------------------------
>
> Key: HADOOP-7423
> URL: https://issues.apache.org/jira/browse/HADOOP-7423
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Reporter: Eli Collins
> Labels: newbie
>
> The topology script documentation is cluster_setup.xml is unclear. The
> topology script:
> # Only needs to handle IP addresses (not hostnames)
> # Needs to handle multiple arguments for caching to work effectively
> We should check in an example script or include an example one in the docs.
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