[MAPREDUCE-1379] Limit both numMapTasks and numReduceTasks

• Type: New Feature
• Status: Resolved
• Priority: Trivial
• Resolution: Won't Fix
• Affects Version/s: 0.22.0
• Component/s: tasktracker
• Assignee: Unassigned
• Reporter: Bochun Bai
• Created: 15/Jan/10 06:30
• Updated: 06/May/10 04:25
• Resolved: 24/Jan/10 23:51

Description

In some environment, the number of concurrent running process is very sensitive.

mapreduce.tasktracker.map.tasks.maximum
and
mapreduce.tasktracker.reduce.tasks.maximum
limit tasks running on each tasktracker separately.

This patch limits them together, using mapreduce.tasktracker.total.tasks.maximum

Issue Links

• duplicates: HADOOP-6749 Add mapred.tasktracker.tasks.maximum to limit the total number of map and reduce tasks