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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1207) Allow admins to set java options for map/reduce tasks
Date Wed, 11 Nov 2009 06:36:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776311#action_12776311
] 

Todd Lipcon commented on MAPREDUCE-1207:
----------------------------------------

+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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