[HADOOP-4854] Capacity Scheduler should read the reclaim-capacity-interval config value from its own config file

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.20.0
• Hadoop Flags: Reviewed
• Assignee: Sreekanth Ramakrishnan
• Reporter: Vivek Ratan
• Created: 12/Dec/08 06:39
• Updated: 08/Jul/09 16:40
• Resolved: 23/Dec/08 08:17

Description

The Capacity Scheduler needs to know the time interval for checking whether capacity needs to be reclaimed. This is represented by the static variable RECLAIM_CAPACITY_INTERVAL. This value is currently read as follows:

    RECLAIM_CAPACITY_INTERVAL = conf.getLong("mapred.capacity-scheduler.reclaimCapacity.interval", 5);

This is incorrect for the following reasons:

• ""mapred.capacity-scheduler.reclaimCapacity.interval" is not present in any of the config files: hadoop-site.xml or capacity-scheduler.xml.
• "mapred.capacity-scheduler.reclaimCapacity.interval" should be specified in the scheduler's config file, capacity-scheduler.xml. It should be read through org.apache.hadoop.mapred.CapacitySchedulerConf.
• The Forrest documentation for the Capacity Scheduler should describe this setting. We should probably create a new sub-section under 'Configuration', titled 'Configuring properties for the Scheduler'.