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https://issues.apache.org/jira/browse/HADOOP-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527803
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eric baldeschwieler commented on HADOOP-1867:
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it would be great if we could automagically choose reasonable defaults. We'll
still want a memory for M-R override since issues like what other code you run
aon a node will dictate your preferred RAM allocated to M-R.
> use single parameter to specify a node's available ram
> ------------------------------------------------------
>
> Key: HADOOP-1867
> URL: https://issues.apache.org/jira/browse/HADOOP-1867
> Project: Hadoop
> Issue Type: Improvement
> Reporter: Doug Cutting
>
> To simplify configuration, we should use a single parameter to indicate a
> node's available RAM. Sites should not need to adjust more than this single
> parameter to configure nodes available memory. In task JVMs, some
> significant percentage of the memory should be reserved for application code,
> with the remainder divided among various system buffers.
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