[MAPREDUCE-1198] Alternatively schedule different types of tasks in fair share scheduler

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.21.0
• Component/s: contrib/fair-share
• Hadoop Flags: Reviewed
• Assignee: Scott Chen
• Reporter: Scott Chen
• Created: 09/Nov/09 21:50
• Updated: 24/Aug/10 21:19
• Resolved: 20/Nov/09 20:05

Description

Matei has mentioned in MAPREDUCE-961 that the current scheduler will first try to launch map tasks until canLaunthTask() returns false then look for reduce tasks. This might starve reduce task. He also mention that alternatively schedule different types of tasks can solve this problem.