[MAPREDUCE-5227] JobTrackerMetricsSource and QueueMetrics should standardize naming rules

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.1.3, 1.2.1
• Component/s: mrv1
• Labels: BB2015-05-TBR
• Target Version/s: 1.3.0
• Assignee: Tsuyoshi Ozawa
• Reporter: Tsuyoshi Ozawa
• Created: 09/May/13 01:46
• Updated: 04/Mar/18 16:07
• Resolved: 04/Mar/18 16:07

Description

JobTrackerMetricsSource and QueueMetrics provides users with some metrics, but its naming rules( "jobs_running", "running_maps", "running_reduces") sometimes confuses users. It should be standardized.

One concern is backward compatibility, so one idea is to share MetricMutableGaugeInt object from old and new property name.
e.g. to share runningMaps from "running_maps" and "maps_running".

Issue Links

• relates to: HADOOP-10045 QueueMetrics 'maps_killed' and 'reduces_killed' are never incremented in branch-1