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Collections.sort() consumes too much time in a scheduling round.
TestFairScheduler#testUpdateDemand and TestFSLeafQueue#testUpdateDemand are failing with NPE
FairScheduler: Move some logs to debug and check if debug logging is enabled
The implementation of Schedulable#getResourceUsage so inefficiency that can reduce the performance of scheduling
Cache resource usage at FSLeafQueue level
FairScheduler: Scheduling performance improvement
FSAppAttempt.getResourceUsage() should not take preemptedResource into account