[jira] [Created] (MAPREDUCE-6871) Allow users to specify racks and nodes for strict locality for AMs

["Robert Kanter (JIRA)" <ji...@apache.org>]

Robert Kanter created MAPREDUCE-6871:
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             Summary: Allow users to specify racks and nodes for strict locality for AMs
                 Key: MAPREDUCE-6871
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6871
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
          Components: client
            Reporter: Robert Kanter
            Assignee: Robert Kanter


YARN-6050 fixed the YARN API to allow multiple {{ResourceRequest}}'s when submitting an AM so that you can actually do rack or node locality.  We should allow MapReduce users to take advantage of this by exposing this functionality in some way.  The raw YARN API allows for a lot of flexibility (e.g. different resources per request, etc), but we don't necessarily want to allow the user to do too much here so they don't shoot themselves in the foot and we don't make this overly complicated.  

I propose we allow users to specify racks and nodes for strict locality.  This would allow users to restrict an MR AM to specific racks and/or nodes.  We could add a new property, {{mapreduce.job.am.resource-request.strict.locality}}, which takes a comma-separated list of entries like:
- {{/<rack>}}
- {{/<rack>/<node>}}
- {{<node>}} (assumes /default-rack)

MapReduce would then use this information to create the corresponding {{ResourceRequest}}'s.  

For example, {{mapreduce.job.am.resource-request.strict.locality=/rack1/node1}} would create the following {{ResourceRequest}}'s:
- resourceName=ANY, relaxLocality=false, capability=<X,Y>
- resourceName=/rack1, relaxLocality=false, capability=<X,Y>
- resourceName=node1, relaxLocality=true, capability=<X,Y>

By default, the property would be unset, and you'd get the normal {{ANY}} {{ResourceRequest}}.



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