[MAPREDUCE-3569] TaskAttemptListener holds a global lock for all task-updates

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.1
• Fix Version/s: 0.23.1
• Component/s: mr-am, mrv2, performance
• Hadoop Flags: Reviewed
• Assignee: Vinod Kumar Vavilapalli
• Reporter: Vinod Kumar Vavilapalli
• Created: 15/Dec/11 23:13
• Updated: 05/Mar/12 02:49
• Resolved: 05/Jan/12 05:21

Description

This got added via MAPREDUCE-3274. We really don't need the lock if we just implement what I mentioned on that ticket here.

This has performance implications on MR AM with lots of tasks.