[HADOOP-4029] NameNode should report status and performance for each replica of image and log

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.0
• Fix Version/s: 0.20.0
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Added name node storage information to the dfshealth page, and moved data node information to a separated page.
• Assignee: Boris Shkolnik
• Reporter: Robert Chansler
• Created: 26/Aug/08 21:56
• Updated: 08/Jul/09 16:43
• Resolved: 09/Dec/08 02:22

Description

The administrator should have immediate access to the status of each replica. In addition to reporting whether the replica is active or not, measured performance should be reported so as to indicate whether a replica might impact cluster performance or might be in danger of failing.

We're probably not close to doing automated replica fail over, but we can give the administrator some clues.

Issue Links

• relates to: HDFS-248 dynamically add/subtract dfs.name.dir directories
• relates to: HADOOP-3860 Compare name-node performance when journaling is performed into local hard-drives or nfs.