It should be able to specify different jvm settings for map and reduce child
process (via mapred.child.map.java.opts and mapred.child.reduce.java.opts
options)
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Key: MAPREDUCE-2003
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2003
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Reporter: Vladimir Klimontovich
Fix For: 0.20.3, 0.21.0, 0.22.0
Sometimes mapper child process requires different JVM settings than reducer.
For example when mapper requires much more memory than reducer.
Now it's only possible to set options for both using mapred.child.java.opts.
Proposed solution: mapred.child.java.opts could be overwritten by
mapred.child.map.java.opts or mapred.child.reduce.java.opts. Thus, we're adding
more flexibility and compatibility with old configurations.
The same should be done for mapred.child.env.
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