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Date: Tue, 15 Sep 2009 02:45:57 -0700 (PDT)
From: "Vinod K V (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-893) Provide an ability to refresh queue
 configuration without restart.
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod K V updated MAPREDUCE-893:
--------------------------------

    Attachment: MAPREDUCE-893-20090915.1.txt

Uploading first patch for review.
 - This defines TaskScheduler.QueueRefresher which scheduler should override so as to support refresh of the queues.
 - QueueManager's refresh code is modified so as to also includes refresh of queues by the schedulers.
 - Implemented  TaskScheduler.QueueRefresher in CapacityTaskScheduler so as to support queue-refresh in this scheduler.
 - Added some basic tests w.r.t verifying capacities and user-limits' refresh.

This needs some more tests to handle failures during refresh. Uploading patch so as to get the first refresh started.

> Provide an ability to refresh queue configuration without restart.
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-893
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-893
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod K V
>         Attachments: MAPREDUCE-893-20090915.1.txt
>
>
> While administering a cluster using multiple queues, administrators feel a need to refresh queue properties on the fly without needing to restart the JobTracker. This is partially supported for some properties such as queue ACLs (HADOOP-5396) and state (HADOOP-5913). The idea is to extend the facility to refresh other queue properties as well, including scheduler properties.

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