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https://issues.apache.org/jira/browse/YARN-3409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15694122#comment-15694122
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Varun Saxena commented on YARN-3409:
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bq. Yes similar to labels we initially plan to consider the constraint
expression present in ANY as final expression.
Although this would have to be discussed in detail when scheduler related
changes for constraints have to be made, but I was thinking about keeping it
flexible. Constraints are not like partitions and not meant for resource
planning but for selection of nodes so application should arguably be allowed
to specify different constraints for host/rack/off switch. Constraints can
frankly be anything so I am not sure if we should restrict. Application may
want to have a specific host for instance irrespective of constraints set for
ANY. We can just take the constraints specified against host / rack / ANY even
if they are different in resource request.
Ongoing and upcoming changes in scheduler would probably mean that constraints
will be in placement sets and hence we should be able to support the scenario
mentioned above.
> Add constraint node labels
> --------------------------
>
> Key: YARN-3409
> URL: https://issues.apache.org/jira/browse/YARN-3409
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: api, capacityscheduler, client
> Reporter: Wangda Tan
> Assignee: Naganarasimha G R
> Attachments: Constraint-Node-Labels-Requirements-Design-doc_v1.pdf
>
>
> Specify only one label for each node (IAW, partition a cluster) is a way to
> determinate how resources of a special set of nodes could be shared by a
> group of entities (like teams, departments, etc.). Partitions of a cluster
> has following characteristics:
> - Cluster divided to several disjoint sub clusters.
> - ACL/priority can apply on partition (Only market team / marke team has
> priority to use the partition).
> - Percentage of capacities can apply on partition (Market team has 40%
> minimum capacity and Dev team has 60% of minimum capacity of the partition).
> Constraints are orthogonal to partition, they’re describing attributes of
> node’s hardware/software just for affinity. Some example of constraints:
> - glibc version
> - JDK version
> - Type of CPU (x86_64/i686)
> - Type of OS (windows, linux, etc.)
> With this, application can be able to ask for resource has (glibc.version >=
> 2.20 && JDK.version >= 8u20 && x86_64).
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