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https://issues.apache.org/jira/browse/MAPREDUCE-478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743132#action_12743132
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Sreekanth Ramakrishnan commented on MAPREDUCE-478:
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The changes look fine but there is an extra line in the diff:
{noformat}
diff --git lib/hadoop-core-0.21.0-dev.jar lib/hadoop-core-0.21.0-dev.jar
index 3c58181..bdd5115 100644
Binary files lib/hadoop-core-0.21.0-dev.jar and lib/hadoop-core-0.21.0-dev.jar
differ
{noformat}
This should be probably the change for {{Shell.getUlimitMemoryCommand(long)}}.
Apart from this minor nit +1 for the patch.
> separate jvm param for mapper and reducer
> -----------------------------------------
>
> Key: MAPREDUCE-478
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-478
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Koji Noguchi
> Assignee: Arun C Murthy
> Priority: Minor
> Fix For: 0.21.0
>
> Attachments: HADOOP-5684_0_20090420.patch,
> MAPREDUCE-478_0_20090804.patch, MAPREDUCE-478_0_20090804_yhadoop20.patch,
> MAPREDUCE-478_1_20090806.patch, MAPREDUCE-478_1_20090806_yhadoop20.patch,
> MAPREDUCE-478_2_20090813.patch, MAPREDUCE-478_2_20090813_yhadoop.patch
>
>
> Memory footprint of mapper and reducer can differ.
> It would be nice if we can pass different jvm param (mapred.child.java.opts)
> for mappers and reducers.
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