[MAPREDUCE-3813] RackResolver should maintain a cache to avoid repetitive lookups.

• Type: Sub-task
• Status: Closed
• Priority: Major
• 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: 05/Feb/12 22:53
• Updated: 05/Mar/12 02:49
• Resolved: 06/Feb/12 22:08

Description

With the current code, during task creation, we repeatedly resolve hosts and RackResolver doesn't cache any of the results. Caching will improve performance.

Issue Links

• blocks: MAPREDUCE-3524 Scan benchmark is more than 1.5x slower in 0.23