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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6596) Introduce Placement Constraint Manager module
Date Thu, 21 Dec 2017 08:30:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-6596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299704#comment-16299704

Konstantinos Karanasos commented on YARN-6596:

bq. Figured allocation tags to nodes mapping is managed by AllocationTagsManager which is
done in YARN-7522.
Yep, I was just writing the same :) Also, YARN-6858 will do the same for node attributes.
Note that constraints can be defined at three levels: at the cluster level, at the application
level, and at the scheduling request level.
Probably if we had constraints only at the scheduling request level, we could do without Placement
Constraint Manager. Although even in that case, it would not be easy to do it if we want to
place multiple scheduling request at a time.
But most of our use cases are at the application level and at the cluster level, so that you
can more easily express constraints across scheduling requests. Also think that a service
will typically define its constraints at the application level when it gets first submitted.
For all those cases, we need a Placement Constraint Manager to hold the constraints across
scheduling requests.

> Introduce Placement Constraint Manager module
> ---------------------------------------------
>                 Key: YARN-6596
>                 URL: https://issues.apache.org/jira/browse/YARN-6596
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Konstantinos Karanasos
>            Assignee: Konstantinos Karanasos
>         Attachments: YARN-6596-YARN-6592.001.patch
> This RM module will be responsible for storing placement constraints, allocation tags,
and node attributes.
> It will be used when determining the placement of SchedulingRequests with constraints.

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