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From "Ahmed Radwan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-140) Add capacity-scheduler-default.xml to provide a default set of configurations for the capacity scheduler.
Date Tue, 02 Oct 2012 17:57:07 GMT
Ahmed Radwan created YARN-140:
---------------------------------

             Summary: 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


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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