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From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4750) Tasks to run on a different jvm version than the TaskTracker
Date Tue, 02 Dec 2008 16:42:44 GMT
Tasks to run on a different jvm version than the TaskTracker
------------------------------------------------------------

                 Key: HADOOP-4750
                 URL: https://issues.apache.org/jira/browse/HADOOP-4750
             Project: Hadoop Core
          Issue Type: New Feature
          Components: mapred
         Environment: linux
            Reporter: Koji Noguchi


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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