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https://issues.apache.org/jira/browse/HADOOP-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nigel Daley resolved HADOOP-2764.
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Resolution: Duplicate
This should be covered by HADOOP-2551.
> specify different heap size for namenode/jobtracker vs. tasktracker/datanodes
> -----------------------------------------------------------------------------
>
> Key: HADOOP-2764
> URL: https://issues.apache.org/jira/browse/HADOOP-2764
> Project: Hadoop Core
> Issue Type: New Feature
> Affects Versions: 0.15.3
> Reporter: Joydeep Sen Sarma
> Priority: Minor
>
> tasktrackers/datanodes should be run with low memory settings. theres a lot
> of competition for memory on slave nodes and these tasks don't need much
> memory anyway and best to keep heap setting low.
> namenode needs higher memory and there's usually lots to spare on separate
> box.
> hadoop-env.sh can provide different heap settings for central vs. slave
> daemons.
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