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https://issues.apache.org/jira/browse/HADOOP-4522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648093#action_12648093
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Vivek Ratan commented on HADOOP-4522:
-------------------------------------
bq. is there some part of the system other than the scheduler that needs to
look at queues?
bq. Beyond scheduling, has there been a need to have the system re-read its
configuration?
Access control for queues (whether queues can accept jobs from particular
users) is system-wide and independent of schedulers. I think we'll want to
support dynamic updates to access control sooner than later. You'll certainly
want to add new users or remove users from a queue's access control fairly
often. You probably don't want to restart the JT each time you want to make
such a change.
> Capacity Scheduler needs to re-read its configuration
> -----------------------------------------------------
>
> Key: HADOOP-4522
> URL: https://issues.apache.org/jira/browse/HADOOP-4522
> Project: Hadoop Core
> Issue Type: New Feature
> Reporter: Vivek Ratan
>
> An external application (an Ops script, or some CLI-based tool) can change
> the configuration of the Capacity Scheduler (change the capacities of various
> queues, for example) by updating its config file. This application then needs
> to tell the Capacity Scheduler that its config has changed, which causes the
> Scheduler to re-read its configuration. It's possible that the Capacity
> Scheduler may need to interact with external applications in other similar
> ways.
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