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

1. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) Nn01 is fenced, and nn01 becomes the active NameNode
B) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
C) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
D) Nn01 is fenced, and nn02 becomes the active NameNode

2. Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?

A) Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
B) Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
C) The choice of operating system isn't very important for a Hadoop cluster.
D) Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode requires less memory and fewer number of disk drives than the DataNodes.
B) The NameNode and DataNodes should have the same hardware configuration.
C) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
D) The NameNode requires more memory and no disk drives.
E) The NameNode requires more memory but less disk capacity.

4. When determining the most appropriate ratio of processor cores to disk drives for a Hadoop cluster, what are the considerations?

A) Processors and disk drives per machine, the workload doesn't matter
B) Disk drives per machine, nothing else matters.
C) Processor core counts and workload type, the ratio doesn't matter
D) Disk drives per core and workload types
E) Disk drives per core without consideration to workload types

5. You have a 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 the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) The order of execution of tasks within a job may vary.
B) When a job is submitted, all tasks belonging to that job are scheduled.
C) Since job B needs only a few tasks, if might finish before job A completes.
D) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.

Solutions: