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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-217) Tasks to run on a different jvm version than the TaskTracker
Date Tue, 03 Nov 2009 11:27:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773019#action_12773019

Amar Kamat commented on MAPREDUCE-217:

Manually tested the patch and checked that the configured jvm's libs/classes are loaded correctly.

> Tasks to run on a different jvm version than the TaskTracker
> ------------------------------------------------------------
>                 Key: MAPREDUCE-217
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-217
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>         Environment: linux
>            Reporter: Koji Noguchi
>            Assignee: Amar Kamat
>         Attachments: mapreduce-217-v1.0.patch, mapreduce-217-v1.1.patch
> We use 32-bit jvm for TaskTrackers. 
> Sometimes our users want to call 64-bit JNI libraries from their tasks.
> This requires tasks to be running on 64-bit jvm.
> On Solaris, you can simply use -d32/-d64 to choose, but on Linux, it's on a completely
different package.
> So far, tasks run on the same jvm version as the TaskTracker.
> {noformat}
> // use same jvm as parent
> File jvm =   new File(new File(System.getProperty("java.home"), "bin"), "java");
> {noformat}
> Is it possible to let users provide a java home path 
> or let them choose from a pre-selected list of paths?

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