[HADOOP-4954] Specify node-rack mapping, dfsadmin -report to warn on mismatch

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: conf
• Assignee: Unassigned
• Reporter: Marco Nicosia
• Created: 30/Dec/08 00:29
• Updated: 18/Nov/09 21:46

Description

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.

Issue Links

• relates to: HADOOP-5258 Provide dfsadmin functionality to report on namenode's view of network topology