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

1. What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB hard drives?

A) RAID 5
B) JBOD
C) RAID 1+0
D) RAID 10

2. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that all blocks in the cluster are 128MB in size.
B) To help HDFS deliver consistent performance under heavy loads.
C) To improve data locality for MapReduce tasks.
D) To ensure that there is capacity in HDFS tor additional data.
E) To ensure that there is consistent disk utilization across the DataNodes.

3. You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?

A) ResourceManager
B) JobTracker
C) ApplicationMaster
D) JournalNode
E) NodeManager

4. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) After a period of time, the TaskTracker will kill the Map Task.
B) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
C) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
D) The job will immediately fail.

5. The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A) The ratio between the number of processor cores and number of disk drives.
B) The ratio between the amount of memory and the number of disk drives.
C) The ratio between the amount of memory and the total storage capacity.
D) The ratio between the number of processor cores and the amount of memory.
E) The ratio between the number of processor cores and total storage capacity.

Solutions: