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https://issues.apache.org/jira/browse/YARN-6050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796139#comment-15796139
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Wangda Tan commented on YARN-6050:
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Thanks [~rkanter], thanks will be very useful!
To make less changes to API and internal implementations, I think an
alternative approach is to expand AM request on the server side.
For example, if AM request.resourceName specified to "/rack", it will be
expanded to \[/rack, *\], and if AM request.resourceName specified to "host",
it will be expanded to \[host, /rack, *\]
If request.relaxLocality set to false, we will add it to the expanded result as
well: for example, if AM request is "host1, relaxLocality=false", the expanded
result will be: \[(host1, relaxLocality=true), (/rack, relaxLocality=false),
(*, relaxLocality=false)\]
With this change, we should be able to only update ApplicationMasterService to
expand request, and all other logics should be the same.
Thoughts?
> AMs can't be scheduled on racks or nodes
> ----------------------------------------
>
> Key: YARN-6050
> URL: https://issues.apache.org/jira/browse/YARN-6050
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.9.0, 3.0.0-alpha2
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Attachments: YARN-6050.001.patch
>
>
> Yarn itself supports rack/node aware scheduling for AMs; however, there
> currently are two problems:
> # To specify hard or soft rack/node requests, you have to specify more than
> one {{ResourceRequest}}. For example, if you want to schedule an AM only on
> "rackA", you have to create two {{ResourceRequest}}, like this:
> {code}
> ResourceRequest.newInstance(PRIORITY, ANY, CAPABILITY, NUM_CONTAINERS, false);
> ResourceRequest.newInstance(PRIORITY, "rackA", CAPABILITY, NUM_CONTAINERS,
> true);
> {code}
> The problem is that the Yarn API doesn't actually allow you to specify more
> than one {{ResourceRequest}} in the {{ApplicationSubmissionContext}}. The
> current behavior is to either build one from {{getResource}} or directly from
> {{getAMContainerResourceRequest}}, depending on if
> {{getAMContainerResourceRequest}} is null or not. We'll need to add a third
> method, say {{getAMContainerResourceRequests}}, which takes a list of
> {{ResourceRequest}} so that clients can specify the multiple resource
> requests.
> # There are some places where things are hardcoded to overwrite what the
> client specifies. These are pretty straightforward to fix.
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