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From "Carlo Curino (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5734) OrgQueue for easy CapacityScheduler queue configuration management
Date Tue, 18 Oct 2016 23:36:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-5734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15587034#comment-15587034

Carlo Curino commented on YARN-5734:

[~jhung] what I was saying is a bit different, but what you mention makes sense. 

What I was pointing out was that we had a solution to tweak (for {{ReservationQueue}}) some
of the key params in a very cheap / dynamic way. As part of YARN-4193 we had in a prototype
the support for node-labels and did some further scalability work (lock tweaks in CS) to make
it scale to many changes per second (300 queues with many node labels updated every sec).
The insight was to do more "surgical" local changes to specific params, instead of large lock-deadly
operations like refreshQueues. 

Said this, I agree that some of the work you guys are doing could be used (if low cost enough)
to enforce the {{Plan}}, and generalize what reservations can "set" in the queues. 

Finally, during our convo with [~mshen] I was pointing out that the {{ReservationSystem}}
can be used to provide a time-varying notion of queues (think a daily sin for the queue capacity),
which in turns could be used to "multiply" the sellable capacity in the cluster. For example,
we could promise highly guaranteed access to the "dev" queue during the day and exclusive
access to the "reporting" queue at night (note that this provides much stronger guarantees
than over-capacity fair sharing).  Integrating this with what you guys have would be neat.

> OrgQueue for easy CapacityScheduler queue configuration management
> ------------------------------------------------------------------
>                 Key: YARN-5734
>                 URL: https://issues.apache.org/jira/browse/YARN-5734
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Min Shen
>            Assignee: Min Shen
>         Attachments: OrgQueue_Design_v0.pdf
> The current xml based configuration mechanism in CapacityScheduler makes it very inconvenient
to apply any changes to the queue configurations. We saw 2 main drawbacks in the file based
configuration mechanism:
> # This makes it very inconvenient to automate queue configuration updates. For example,
in our cluster setup, we leverage the queue mapping feature from YARN-2411 to route users
to their dedicated organization queues. It could be extremely cumbersome to keep updating
the config file to manage the very dynamic mapping between users to organizations.
> # Even a user has the admin permission on one specific queue, that user is unable to
make any queue configuration changes to resize the subqueues, changing queue ACLs, or creating
new queues. All these operations need to be performed in a centralized manner by the cluster
> With these current limitations, we realized the need of a more flexible configuration
mechanism that allows queue configurations to be stored and managed more dynamically. We developed
the feature internally at LinkedIn which introduces the concept of MutableConfigurationProvider.
What it essentially does is to provide a set of configuration mutation APIs that allows queue
configurations to be updated externally with a set of REST APIs. When performing the queue
configuration changes, the queue ACLs will be honored, which means only queue administrators
can make configuration changes to a given queue. MutableConfigurationProvider is implemented
as a pluggable interface, and we have one implementation of this interface which is based
on Derby embedded database.
> This feature has been deployed at LinkedIn's Hadoop cluster for a year now, and have
gone through several iterations of gathering feedbacks from users and improving accordingly.
With this feature, cluster administrators are able to automate lots of thequeue configuration
management tasks, such as setting the queue capacities to adjust cluster resources between
queues based on established resource consumption patterns, or managing updating the user to
queue mappings. We have attached our design documentation with this ticket and would like
to receive feedbacks from the community regarding how to best integrate it with the latest
version of YARN.

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