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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-853) Support a hierarchy of queues in the Map/Reduce framework
Date Thu, 13 Aug 2009 04:51:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742713#action_12742713

Hemanth Yamijala commented on MAPREDUCE-853:

The motivation for hierarchical queues is discussed in the [proposal on MAPREDUCE-824|https://issues.apache.org/jira/browse/MAPREDUCE-824?focusedCommentId=12738975&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12738975],
for those interested.

Briefly, hierarchical queues allow administrators to have a greater control over how capacity
(or conceivably other policies) associated with a queue can be used. They also allow delegation
of control. Large clusters could have root level queues set up for organizations, and then
operators from the organizations could be given access to manage queues under the root level
queues (which we are calling sub-queues in MAPREDUCE-824).

> Support a hierarchy of queues in the Map/Reduce framework
> ---------------------------------------------------------
>                 Key: MAPREDUCE-853
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-853
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: jobtracker
>            Reporter: Hemanth Yamijala
>             Fix For: 0.21.0
> In MAPREDUCE-824, we proposed introducing a hierarchy of queues in the capacity scheduler.
Currently, the M/R framework provides the notion of job queues and handles some functionality
related to queues in a scheduler-agnostic manner. This functionality includes:
> - Managing the list of ACLs for queues
> - Managing the run state of queues - running or stopped
> - Displaying scheduling information about queues in the jobtracker web UI and job client
> - Displaying list of jobs in a queue in the jobtracker web UI and job client CLI
> - Providing APIs for list queues and queue information in JobClient.
> Since it would be beneficial to extend this functionality to hierarchical queues, this
JIRA is proposing introducing the concept into the map/reduce framework as well. We could
treat this as an umbrella JIRA and file additional tasks for each of the changes involved,
sticking to the high level approach in this JIRA.

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