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From "MengWang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2345) Optimize jobtracker's memory usage
Date Fri, 04 Mar 2011 07:04:37 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

MengWang updated MAPREDUCE-2345:
--------------------------------

    Description: Too 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.   (was: 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. )

> 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
>              Labels: hadoop
>             Fix For: 0.23.0
>
>         Attachments: jt-memory-useage.bmp
>
>
> Too 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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