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https://issues.apache.org/jira/browse/MAPREDUCE-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889787#action_12889787
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Arun C Murthy commented on MAPREDUCE-1207:
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Forcing users to set 'mapred.child.java.opts.user' rather than
mapred.child.java.opts is an incompabtible change.
> 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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