[jira] Updated: (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:all-tabpanel ]

Jakob Homan updated HADOOP-4954:
--------------------------------

    Assignee:     (was: Jakob Homan)

> Specify node-rack mapping, dfsadmin -report to warn on mismatch
> ---------------------------------------------------------------
>
>                 Key: HADOOP-4954
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4954
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Marco Nicosia
>
> 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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