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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (MAPREDUCE-4427) Enable the RM to work with AM's that are not managed by it
Date Thu, 11 Oct 2012 17:50:27 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy closed MAPREDUCE-4427.
------------------------------------

    
> Enable the RM to work with AM's that are not managed by it
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-4427
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4427
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>              Labels: mrv2
>             Fix For: 2.0.2-alpha
>
>         Attachments: MAPREDUCE-4427-1.patch, MAPREDUCE-4427-2.patch, MAPREDUCE-4427-3.patch
>
>
> Currently, the RM itself manages the AM by allocating a container for it and negotiating
the launch on the NodeManager and manages the AM lifecycle. Thereafter, the AM negotiates
resources with the RM and launches tasks to do the real work.
> It would be a useful improvement to enhance this model by allowing the AM to be launched
independently by the client without requiring the RM. These AM's would be launched on a gateway
machine that can talk to the cluster. This would open up new use cases such as the following
> 1) Easy debugging of AM, specially during initial development. Having the AM launched
on an arbitrary cluster node makes it hard to looks at logs or attach a debugger to the AM.
If it can be launched locally then these tasks would be easier.
> 2) Running AM's that need special privileges that may not be available on machines managed
by the NodeManager

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