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From "Jonathan Hung (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5734) OrgQueue for easy CapacityScheduler queue configuration management
Date Sat, 21 Jan 2017 01:01:29 GMT

    [ https://issues.apache.org/jira/browse/YARN-5734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15832692#comment-15832692

Jonathan Hung commented on YARN-5734:

Uploaded an initial patch containing some basic end-to-end functionality.
Here are yarn-site.xml configurations to get this working:
* {{yarn.scheduler.capacity.config.path}} should be set to a directory inside which the database
will be stored. (resource manager user should be able to create subdirectories in here)
* {{yarn.scheduler.mutable-queue-config.enabled}} should be {{true}}
* {{yarn.resourcemanager.configuration.provider-class}} should be set to {{org.apache.hadoop.yarn.server.resourcemanager.conf.MutableConfigurationManager}}

Here's some working examples which can be run in series, assuming a starting configuration
of two queues, {{root.default}} (with 100 capacity) and {{root.test}} (with 0 capacity):
{noformat}curl -X PUT -H 'Content-Type: application/xml' -d '<schedConf>
</schedConf>' --negotiate -u : "http://<rmHost>:8088/ws/v1/cluster/conf/scheduler/mutate"{noformat}
Sets the {{root.test}} queue's state to STOPPED and its maximum-applications to 33.

{noformat}curl -X PUT -H 'Content-Type: application/xml' -d '<schedConf>
</schedConf>' --negotiate -u : "http://<rmHost>:8088/ws/v1/cluster/conf/scheduler/mutate"{noformat}
Removes the {{root.test}} queue (since it is STOPPED, leveraging YARN-5556)

{noformat}curl -X PUT -H 'Content-Type: application/xml' -d '<schedConf>
</schedConf>' --negotiate -u : "http://<rmHost>:8088/ws/v1/cluster/conf/scheduler/mutate"{noformat}
Adds a {{root.test2}} queue. Also sets its maximum-applications to 34.

This is just a first version, so there are some details that are not yet implemented/tested
(e.g. specifying a hierarchical conf update). [~xgong] and [~wangda], do you mind taking a
look to make sure our ideas/interfaces are in alignment?

> 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_API-Based_Config_Management_v1.pdf, OrgQueueAPI-BasedSchedulerConfigurationManagement_v2.pdf,
OrgQueue_Design_v0.pdf, YARN-5734-YARN-5734.001.patch
> 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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