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https://issues.apache.org/jira/browse/MAPREDUCE-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13623376#comment-13623376
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Harsh J commented on MAPREDUCE-5130:
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bq. mapreduce.map/reduce.child.java.opts
These are on purpose. If we added defaults, they would override the
mapred.child.java.opts being set by clients today and break compatibility.
Is the list for 1.x or trunk? Cause I see some of these other options on
trunk's mapred-default.xml?
> Add missing job config options to mapred-default.xml
> ----------------------------------------------------
>
> Key: MAPREDUCE-5130
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5130
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
>
> I came across that mapreduce.map.child.java.opts and
> mapreduce.reduce.child.java.opts were missing in mapred-default.xml. I'll do
> a fuller sweep to see what else is missing before posting a patch.
> List so far:
> mapreduce.map/reduce.child.java.opts
> mapreduce.map/reduce.memory.mb
> mapreduce.map/reduce.log.level
> mapreduce.job.jvm.numtasks
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