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CCA-500 free demo, Cloudera Certified Administrator for Apache Hadoop (CCAH)
NO.1 During the execution of a MapReduce v2 (MRv2) job on YARN, where does the
Mapper place
the intermediate data of each Map Task?
A. The Mapper stores
the intermediate data in HDFS on the node where the Map tasks ran in the
HDFS
/usercache/&(user)/apache/application_&(appid) directory for the user
who ran the job
B. YARN holds the intermediate data in the NodeManager's
memory (a container) until it is
transferred to the Reducer
C. The Mapper
stores the intermediate data on the node running the Job's ApplicationMaster so
that
it is available to YARN ShuffleService before the data is presented to
the Reducer
D. The Mapper transfers the intermediate data immediately to the
reducers as it is generated by the
Map Task
E. The Mapper stores the
intermediate data on the underlying filesystem of the local disk in
the
directories yarn.nodemanager.locak-DIFS
Answer: E
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NO.2 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. Capacity
Scheduler
B. Complexity Fair Scheduler (CFS)
C. Fair Scheduler
D. FIFO
Scheduler
Answer: C
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Reference:
http://hadoop.apache.org/docs/r1.2.1/fair_scheduler.html
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