use single parameter to specify a node's available ram
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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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