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https://issues.apache.org/jira/browse/MAPREDUCE-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895079#action_12895079
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Dick King commented on MAPREDUCE-1207:
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{{TaskRunner.java}} :
API nomenclature: {{MAPRED_MAP_ADMIN_JAVA_OPTS}} etc. is a property that
contains options, not a set of options like {{DEFAULT_MAPRED_ADMIN_JAVA_OPTS}}
, and should probably be named {{MAP_ADMIN_JAVA_OPTS_PROPNAME}} . There should
probably be such a property for mapred as well as the two separate properties
for map and reduce.
funny return value: {{getVMEnvironment}} [and after the patch,
{{setEnvFromInputString}} ] only ever returns its first parameter,
{{errorInfo}} , if it returns at all. The return value is certainly not
pulling its weight, and the method should be {{void}} .
functionality lack: Environment value substitution is extremely specialized.
It can basically only handle expansions to path-like environment variables.
The original code had this property, but with the new code it looks like we
should to be able to handle more cases. In particular,
{{updateUserLoginEnv(...) }} sets several environment variables such as
{{USER}} . The administrator is likely to want to be able to expand {{$USER}}
in a new environment variable value [ie., perhaps a path name].
{{TestTaskEnvironment.java}}
Environment variable substitution is not tested, even the limited version that
we support.
> 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
> Assignee: Krishna Ramachandran
> Attachments: mapred-1207.patch
>
>
> 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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