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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6871) Allow users to specify racks and nodes for strict locality for AMs
Date Thu, 20 Apr 2017 19:26:04 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977310#comment-15977310

Robert Kanter commented on MAPREDUCE-6871:

Test failure unrelated

> 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
>         Attachments: MAPREDUCE-6871.001.patch, MAPREDUCE-6871.002.patch, MAPREDUCE-6871.003.patch,
MAPREDUCE-6871.004.patch, MAPREDUCE-6871.005.patch, MAPREDUCE-6871.005.patch
> 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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