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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6749) Add mapred.tasktracker.tasks.maximum to limit the total number of map and reduce tasks
Date Wed, 05 May 2010 05:50:03 GMT
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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