Specify node-rack mapping, dfsadmin -report to warn on mismatch
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Key: HADOOP-4954
URL: https://issues.apache.org/jira/browse/HADOOP-4954
Project: Hadoop Core
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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