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NO.1 Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within
a reasonable time without starting long-running jobs?
A. Fair Scheduler
B. Complexity Fair Scheduler (CFS)
C. Capacity Scheduler
D. FIFO Scheduler
Answer: A

CCA-500 Real Exams   CCA-500 practice test   
Reference: http://hadoop.apache.org/docs/r1.2.1/fair_scheduler.html

NO.2 You are running a Hadoop cluster with MapReduce version 2 (MRv2) on YARN. You consistently
see that MapReduce map tasks on your cluster are running slowly because of excessive garbage
collection of JVM, how do you increase JVM heap size property to 3GB to optimize performance?
A. yarn.application.child.java.opts=-Xmx3072m
B. mapreduce.map.java.opts=-Xmx3072m
C. mapreduce.map.java.opts=-Xms3072m
D. yarn.application.child.java.opts=-Xsx3072m
Answer: C

CCA-500 Questions and answers   
Reference: http://hortonworks.com/blog/how-to-plan-and-configure-yarn-in-hdp-2-0/