[MAPREDUCE-4312] Add metrics to RM for NM heartbeats

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: 2.0.0-alpha
• Component/s: mrv2, resourcemanager
• Target Version/s: 0.23.3
• Assignee: Jason Darrell Lowe
• Reporter: Jason Darrell Lowe
• Created: 04/Jun/12 22:12
• Updated: 05/Jun/12 21:20
• Resolved: 05/Jun/12 21:20

Description

It would be nice to have a metric in the ResourceManager to track the number of NodeManager heartbeats processed. The JobTracker in 1.0 has a tasktracker heartbeat metric, and it would be nice if the RM had the equivalent metric.