[MAPREDUCE-4385] FairScheduler.maxTasksToAssign() should check for fairscheduler.assignmultiple.maps < TaskTracker.availableSlots

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.3
• Fix Version/s: 1.2.0
• Hadoop Flags: Reviewed
• Assignee: Karthik Kambatla
• Reporter: Karthik Kambatla
• Created: 28/Jun/12 20:36
• Updated: 03/Nov/14 18:33
• Resolved: 05/Jul/12 16:55

Description

FairScheduler.maxTasksToAssign() can potentially return a value greater than the available slots. Currently, we rely on canAssignMaps()/canAssignReduces() to reject such requests.

These additional calls can be avoided by check against the available slots in maxTasksToAssign().