[HADOOP-6749] Add mapred.tasktracker.tasks.maximum to limit the total number of map and reduce tasks

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.20.2
• Component/s: conf
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 05/May/10 05:48
• Updated: 06/May/10 04:25
• Resolved: 06/May/10 04:24

Description

We have mapred.tasktracker.map.tasks.maximum and mapred.tasktracker.reduce.tasks.maximum now.

It is desirable to have mapred.tasktracker.tasks.maximum which limits the total number of map and reduce tasks. Meaning its value may be lower than (mapred.tasktracker.map.tasks.maximum + mapred.tasktracker.reduce.tasks.maximum)
This would be useful in a cluster whose nodes are multi-core.

Issue Links

• is duplicated by: MAPREDUCE-1379 Limit both numMapTasks and numReduceTasks