[MAPREDUCE-3589] Add metrics to tasktracker to indicate the number of slots occupied

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.20.203.0, 0.20.205.0, 0.22.0
• Component/s: tasktracker
• Labels: patch
• Target Version/s: 0.20.203.0, 0.20.205.0, 0.22.0
• Assignee: Unassigned
• Reporter: chunde
• Created: 21/Dec/11 10:18
• Updated: 21/Dec/11 10:27

Description

The number of tasks running on the tasktracker is indicated by maps/reduces_running metrics. But, if multiple slots occupied by a task(capacity scheduler), we can not get info of the slot. So, add metrics to tasktracker to indicate the number of slots occupied