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https://issues.apache.org/jira/browse/MAPREDUCE-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776311#action_12776311
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Todd Lipcon commented on MAPREDUCE-1207:
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+1 for the idea, though I wonder which should take precedence - should the
admin options come first or second?
Could this not be done by changing the default configuration to be final
"-Djava.net.preferIPv4Stack=true ${mapred.child.java.opts.user}" and then
having users use that property to append their options?
> Allow admins to set java options for map/reduce tasks
> -----------------------------------------------------
>
> Key: MAPREDUCE-1207
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1207
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: client
> Reporter: Arun C Murthy
>
> It will be useful for allow cluster-admins to set some java options for child
> map/reduce tasks.
> E.g. We've had to ask users to set -Djava.net.preferIPv4Stack=true in their
> jobs, it would be nice to do it for all users in such scenarios even when
> people override mapred.child.{map|reduce}.java.opts but forget to add this.
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