[HADOOP-2816] Cluster summary at name node web has confusing report for space utilization

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.19.0
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Improved space reporting for NameNode Web UI. Applications that parse the Web UI output should be reviewed.
• Assignee: Suresh Srinivas
• Reporter: Robert Chansler
• Created: 14/Feb/08 02:32
• Updated: 06/Jan/11 09:07
• Resolved: 19/Sep/08 22:43

Description

In one example:
Cluster Summary
Capacity : 1.15 PB
DFS Remaining : 192 TB
DFS Used : 717 TB
DFS Used% : 62 %

Why is Capacity not equal Used plus Remaining?

(The answer is that there is an estimated reserve for local files.)

The presentation should be easily understood by the user.

Issue Links

• is blocked by: HADOOP-4430 Namenode Web UI capacity report is inconsistent with Balancer
• is related to: HADOOP-4281 Capacity reported in some of the commands is not consistent with the Web UI reported data
• relates to: HDFS-1564 Make dfs.datanode.du.reserved configurable per volume