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From "Konstantinos Karanasos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7822) Constraint satisfaction checker support for composite OR and AND constraints
Date Fri, 26 Jan 2018 15:15:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341147#comment-16341147
] 

Konstantinos Karanasos commented on YARN-7822:
----------------------------------------------

Hi [~cheersyang], so maxCardinality does a check of <= at the state of the cluster before
the allocation that is currently being attempted. In your case, you have maxCard=3, so n1
is a valid node as it has 3. Indeed after the allocation it will end up having 4, so you would
have to make your maxCard=2 to have at most 3, since we are looking at the pre-allocation
state. I had mentioned this case in a comment somewhere. 

> Constraint satisfaction checker support for composite OR and AND constraints
> ----------------------------------------------------------------------------
>
>                 Key: YARN-7822
>                 URL: https://issues.apache.org/jira/browse/YARN-7822
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Weiwei Yang
>            Priority: Major
>         Attachments: YARN-7822-YARN-6592.001.patch
>
>
> JIRA to track changes to {{PlacementConstraintsUtil#canSatisfyConstraints}} handle OR
and AND Composite constaints



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