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From "Brice Arnould (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3675) Provide more flexibility in the way tasks are run
Date Tue, 01 Jul 2008 10:45:45 GMT
Provide more flexibility in the way tasks are run
-------------------------------------------------

                 Key: HADOOP-3675
                 URL: https://issues.apache.org/jira/browse/HADOOP-3675
             Project: Hadoop Core
          Issue Type: New Feature
          Components: mapred
            Reporter: Brice Arnould
            Assignee: Brice Arnould
            Priority: Minor


*The aim*
With [HADOOP-3421] speaking about sharing a cluster among more than one organization (so potentially
with non-cooperative users), and posts on the ML speaking about virtualization and the ability
to re-use the TaskTracker's VM to run new tasks, it could be useful for admins to choose the
way TaskRunners run their children. 

More specifically, it could be useful to provide a way to imprison a Task in its working directory,
or in a virtual machine.
In some cases, reusing the VM might be useful, since it seems that this feature is really
wanted ([HADOOP-249]).

*Concretely*
What I propose is a new class, called called SeperateVMTaskWrapper which contains the current
logic for running tasks in another JVM. This class extends another, called TaskWrapper, which
could be inherited to provide new ways of running tasks.
As part of this issue I would also like to provide two other TaskWrappers : the first would
run the tasks as Thread of the TaskRunner's VM (if it is possible without too much changes),
the second would use a fixed pool of local unix accounts to insulate tasks from each others
(so potentially non-cooperating users will be hable to share a cluster, as described in [HADOOP-3421]).

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