[jira] Commented: (HADOOP-4954) Specify node-rack mapping, dfsadmin -report to warn on mismatch

["Jakob Homan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678141#action_12678141 ] 

Jakob Homan commented on HADOOP-4954:
-------------------------------------

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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