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https://issues.apache.org/jira/browse/MAPREDUCE-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000464#comment-13000464
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Arun C Murthy commented on MAPREDUCE-279:
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@Min
bq. How does ApplicationMaster know its resource requirements before it
launches tasks?
The assumption is that the AM has a basic idea about resource requirements for
it's application which is feasible for our primary use case: Map-Reduce. OTOH,
an AM for other applications has the ability to launch a few tasks, watch their
resource consumption/utilization and update future resource requests.
bq. Even common users can deploy their ApplicationMaster over the cluster they
have no any permissions on that?
>From the framework (i.e. RM/NN) perspective, everything in the cluster
>including AMs is 'user-land'. Thus as long as a user implements the protocols
>for AMs they can deploy any applications... they do not need any permission to
>deploy.
I'm working very hard to get the codebase committed to a branch, once there we
would love your f/b on the protocols etc. Hopefully that should help you
understand how to implement a custom AM if you so choose... appreciate your
patience while I work the system! *smile*
> Map-Reduce 2.0
> --------------
>
> Key: MAPREDUCE-279
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-279
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker, tasktracker
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Fix For: 0.23.0
>
>
> Re-factor MapReduce into a generic resource scheduler and a per-job,
> user-defined component that manages the application execution.
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