[MAPREDUCE-1684] ClusterStatus can be cached in CapacityTaskScheduler.assignTasks()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.2
• Fix Version/s: 1.2.0
• Component/s: capacity-sched
• Target Version/s: 1.2.0
• Assignee: Koji Noguchi
• Reporter: Amareshwari Sriramadasu
• Created: 07/Apr/10 10:46
• Updated: 15/May/13 05:16
• Resolved: 28/Aug/12 21:29

Description

Currently, CapacityTaskScheduler.assignTasks() calls getClusterStatus() thrice: once in assignTasks(), once in MapTaskScheduler and once in ReduceTaskScheduler. It can be cached in assignTasks() and re-used.

Issue Links

• relates to: MAPREDUCE-4499 Looking for speculative tasks is very expensive in 1.x