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https://issues.apache.org/jira/browse/YARN-8013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423394#comment-16423394
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Konstantinos Karanasos commented on YARN-8013:
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+1, thanks [~cheersyang].
(There seem to be a couple of checkstyle issues and a failing test, but
otherwise +1 from me).
BTW, since you are on this part of the code, I was checking some things today
and found that we allow the application namespace to be null. Then once we
check it, we substitute it with Self as the default in case of null. I think we
should instead make it Self by default in the PlacementConstraints and never
let it be null. This way also simplify the checking code. I just mention it
here in case you are at it -- of course it is not part of this JIRA.
> Support APP-TAG namespace for allocation tags
> ---------------------------------------------
>
> Key: YARN-8013
> URL: https://issues.apache.org/jira/browse/YARN-8013
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Priority: Major
> Attachments: YARN-8013.001.patch, YARN-8013.002.patch,
> YARN-8013.003.patch, YARN-8013.004.patch, YARN-8013.005.patch,
> YARN-8013.006.patch
>
>
> YARN-1461 adds *Application Tag* concept to Yarn applications, user is able
> to annotate application with multiple tags to classify apps. We can leverage
> this to represent a namespace for a certain group of apps. So instead of
> calling *app-label*, propose to call it *app-tag*.
> A typical use case is,
> There are a lot of TF jobs running on Yarn, and some of them are consuming
> resources heavily. So we want to limit number of PS on each node for such BIG
> players but ignore those SMALL ones. To achieve this, we can do following
> steps:
> # Add application tag "big-tf" to these big TF jobs
> # For each PS request, we add "ps" source tag and map it to constraint
> "{color:#d04437}notin, node, tensorflow/ps{color}" or
> "{color:#d04437}cardinality, node, tensorflow/ps{color}{color:#d04437}, 0,
> 2{color}" for finer grained controls.
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