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Date: Wed, 3 Oct 2012 14:36:08 +1100 (NCT)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-140) Add capacity-scheduler-default.xml to
 provide a default set of configurations for the capacity scheduler.
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    [ https://issues.apache.org/jira/browse/YARN-140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13468310#comment-13468310 ] 

Alejandro Abdelnur commented on YARN-140:
-----------------------------------------

Or, another possibility, is to ensure CS uses *conf.get(KEY,DEFAULT)* for all the read configuration, then we can remove the *capacity-scheduler.xml* from the JAR and make it available in the *conf/* dir.
                
> Add capacity-scheduler-default.xml to provide a default set of configurations for the capacity scheduler.
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-140
>                 URL: https://issues.apache.org/jira/browse/YARN-140
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>            Reporter: Ahmed Radwan
>            Assignee: Ahmed Radwan
>         Attachments: YARN-140.patch
>
>
> When setting up the capacity scheduler users are faced with problems like:
> {code}
> FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
> java.lang.IllegalArgumentException: Illegal capacity of -1 for queue root
> {code}
> Which basically arises from missing basic configurations, which in many cases, there is no need to explicitly provide, and a default configuration will be sufficient. For example, to address the error above, the user need to add a capacity of 100 to the root queue.
> So, we need to add a capacity-scheduler-default.xml, this will be helpful to provide the basic set of default configurations required to run the capacity scheduler. The user can still override existing configurations or provide new ones in capacity-scheduler.xml. This is similar to *-default.xml vs *-site.xml for yarn, core, mapred, hdfs, etc.

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