[YARN-140] Add capacity-scheduler-default.xml to provide a default set of configurations for the capacity scheduler.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.3-alpha
• Component/s: capacityscheduler
• Assignee: Ahmed Radwan
• Reporter: Ahmed Radwan
• Created: 02/Oct/12 17:55
• Updated: 02/May/13 02:30
• Resolved: 19/Oct/12 23:18

Description

When setting up the capacity scheduler users are faced with problems like:

FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
java.lang.IllegalArgumentException: Illegal capacity of -1 for queue root

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.

Issue Links

• relates to: OOZIE-1040 Revert OOZIE-1029 once YARN-140 is part of a Hadoop release
• relates to: YARN-143 CapacitySchedulerConfiguration#getCapacity should return 100.0f for root queue
• relates to: YARN-181 capacity-scheduler.xml move breaks Eclipse import