Add mapred.tasktracker.tasks.maximum to limit the total number of map and
reduce tasks
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Key: HADOOP-6749
URL: https://issues.apache.org/jira/browse/HADOOP-6749
Project: Hadoop Common
Issue Type: New Feature
Components: conf
Affects Versions: 0.20.2
Reporter: Ted Yu
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.
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