DFSNodesStatus() should sort data nodes.
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Key: HADOOP-415
URL: http://issues.apache.org/jira/browse/HADOOP-415
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.4.0
Reporter: Konstantin Shvachko
Fix For: 0.5.0
HADOOP-392 introduced a new TreeMap member (datanodeMapByName) in the name node.
It is used solely for reporting the data nodes in the UI sorted by their names.
I think it is quite inefficient both time and space-wise to support an excessive
data structure just for that.
Suppose the UI will also require sorting by last heartbeat and/or by the
available space....
I think DFSNodesStatus() should just sort the original datanodeMap before
returning the list.
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