MapReduce Service Check fails.

MapReduce service check fails in installer wizard as JobTracker instantly goes
down after coming up. Recurrent tries to start JobTracker fails with following
error logged in jobtracker log.
*JobTracker Log:*

2014-05-16 21:38:55,901 FATAL org.apache.hadoop.mapred.JobTracker: java.io.IOException: Queue 'default' doesn't have configured capacity!
at org.apache.hadoop.mapred.CapacityTaskScheduler.parseQueues(CapacityTaskScheduler.java:917)
at org.apache.hadoop.mapred.CapacityTaskScheduler.start(CapacityTaskScheduler.java:834)
at org.apache.hadoop.mapred.JobTracker.offerService(JobTracker.java:2163)
at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4711)

2014-05-16 21:38:55,904 INFO org.apache.hadoop.mapred.JobTracker: SHUTDOWN_MSG:

*capacity-scheduler.xml* is present in /etc/hadoop/conf .empty path but *missing* in /etc/hadoop/conf path