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https://issues.apache.org/jira/browse/HADOOP-4954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678141#action_12678141
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Jakob Homan commented on HADOOP-4954:
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Since the question would appear to boil down to: does the output of running the
dfs.hosts file through the topology script agree with what we expect it to
based on how we laid out the network, perhaps we should look at a script/tool
that answers that question offline and could be run however is useful. Also,
checkout out HADOOP-5258.
> Specify node-rack mapping, dfsadmin -report to warn on mismatch
> ---------------------------------------------------------------
>
> Key: HADOOP-4954
> URL: https://issues.apache.org/jira/browse/HADOOP-4954
> Project: Hadoop Core
> Issue Type: Improvement
> Components: conf
> Reporter: Marco Nicosia
> Assignee: Jakob Homan
>
> It would be helpful if the operator had some way to specify what rack a node
> is in, perhaps as an annotation in the dfs.hosts file? Subsequently, if a
> node reports that it is in a different rack than specified, dfsadmin -report
> can issue a warning on that fact.
> An additional warning would also be nice: If a rack is configured to have X
> hosts, but in fact has some significant percentage (configurable?) fewer
> hosts than configured, dfsadmin -report should advert to that fact as well.
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