[MAPREDUCE-3827] Counters aggregation slowed down significantly after MAPREDUCE-3749

• Type: Sub-task
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: 0.23.1
• Component/s: mrv2, performance
• Assignee: Vinod Kumar Vavilapalli
• Reporter: Vinod Kumar Vavilapalli
• Created: 07/Feb/12 01:55
• Updated: 05/Mar/12 02:49
• Resolved: 08/Feb/12 00:17

Issue Links

• blocks: MAPREDUCE-3524 Scan benchmark is more than 1.5x slower in 0.23
• is broken by: MAPREDUCE-3749 ConcurrentModificationException in counter groups