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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
B) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
C) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
D) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
E) The order of execution of tasks within a job may vary.
F) Tasks are scheduled in the order of their jobs' submission.

2. Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.
B) When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.
C) When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.
D) When the typical workloads consists of processor-intensive tasks.

3. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) Seventy percent of DataNodes simultaneously fail.
B) Multiple racks simultaneously fail.
C) All DataNodes simultaneously fail.
D) Ten percent of DataNodes simultaneously fail.
E) An entire rack fails.

4. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job A gets submitted, it doesn't consume all the task slots.
B) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
C) When job B gets submitted, job A has to finish first, before job B can get scheduled.
D) When job A gets submitted, it consumes all the task slots.

5. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) 30
B) 1
C) We cannot say; the number of Mappers is determined by the developer
D) 10

Solutions: