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Posted to mapreduce-dev@hadoop.apache.org by "MengWang (JIRA)" <ji...@apache.org> on 2011/02/25 04:26:38 UTC

[jira] Created: (MAPREDUCE-2345) Optimize jobtracker's memory usage

Optimize jobtracker's  memory usage  
-------------------------------------

                 Key: MAPREDUCE-2345
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2345
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: jobtracker
    Affects Versions: 0.21.0
            Reporter: MengWang
             Fix For: 0.23.0


To many tasks will eat up a considerable amount of JobTracker's heap space. According to our observation, 50GB heap size can support to 5,000,000 tasks, so we should optimize jobtracker's memory usage for more jobs and tasks. Yourkit java profile show that counters, duplicate strings, Task waste too much memory. Our optimization around these three points reduced jobtracker's memory to 1/3. 

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