Bikas Saha created MAPREDUCE-4427:
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Summary: 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
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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