[MAPREDUCE-861] Modify queue configuration format and parsing to support a hierarchy of queues.

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.21.0
• Component/s: jobtracker
• Hadoop Flags: Reviewed

Release Note

Added support for hierarchical queues in the Map/Reduce framework with the following changes:
- mapred-queues.xml is modified to a new XML template as mentioned in the JIRA.
- Modified JobQueueInfo to contain a handle to child queues.
- Added new APIs in the client to get 'root' queues, so that the entire hierarchy of queues can be iterated.
-Added new APIs to get the child queues for a given queue .

• Assignee: rahul k singh
• Reporter: Hemanth Yamijala
• Created: 13/Aug/09 11:41
• Updated: 24/Aug/10 21:15
• Resolved: 16/Sep/09 04:50

Description

MAPREDUCE-853 proposes to introduce a hierarchy of queues into the Map/Reduce framework. This JIRA is for defining changes to the configuration related to queues.

The current format for defining a queue and its properties is as follows: mapred.queue.<queue-name>.<property-name>. For e.g. mapred.queue.<queue-name>.acl-submit-job. The reason for using this verbose format was to be able to reuse the Configuration parser in Hadoop. However, administrators currently using the queue configuration have already indicated a very strong desire for a more manageable format. Since, this becomes more unwieldy with hierarchical queues, the time may be good to introduce a new format for representing queue configuration.

Issue Links

• blocks: MAPREDUCE-893 Provide an ability to refresh queue configuration without restart.