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

1. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file successfully writes to /users/reports/myreports/myreport.txt.
B) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
C) The client throws an exception.
D) The file writes fails silently; no file is written, no error is reported.

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) Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.
D) The choice of operating system isn't very important for a Hadoop cluster.

3. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A) One active NameNode and one Standby NameNode
B) Two active NameNodes and two Standby NameNodes
C) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
D) Two active NameNodes and one Standby NameNode

4. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

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

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

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

Solutions: