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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8013) Support APP-TAG namespace for allocation tags
Date Fri, 30 Mar 2018 22:57:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16421040#comment-16421040

Konstantinos Karanasos commented on YARN-8013:

Thanks again for working on this, [~cheersyang].

Patch looks mostly fine, but from a quick look it feels that the AllocationTagsManager exposes
a bit too much information at the moment. So we have the {{getApplicationIdToTags}} method
that returns all existing applications and their tags (which can be too many). Then we create
{{TargetApplications}} with all this information, although I think the nsScope is given, right?

Why not have a method inside the tags manager that takes an nsScope and returns only the target
applications for that nsScope, rather than exposing all this?

It seems that this will simplify the code of {{TargetApplications}} too.

Other than that, a couple of minor things:
 * AllocationTagNamespace is a slightly misleading name, as it does not reveal that it essentially
defines the applications to which a constraint will refer
 * When defining {{getApplicationIdToTags}}: perAppNodeMappings.keySet().contains() ->

> 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-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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