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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:
1. When setting the HDFS block size, which of the following considerations is the least important?
A) Number of files that will be stored in HDFS.
B) Disk capacity of the NameNode.
C) Amount of memory on the NameNode.
D) Number of DataNodes.
E) Size of "typical" files that will be stored in HDFS.
2. What do you need to do when adding new slave nodes to a cluster?
A) Add a new entry to /etc/slavenodes on the NameNode host.
B) add the new node's DNS name to the conf/slaves file on the master node.
C) Restart the NameNode daemon.
D) Halt and resubmit any running MapReduce jobs to guarantee correctness.
E) Increase the value of dfs.number.of.nodes in hdfs-site.xml.
3. Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?
A) Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
B) The choice of operating system isn't very important for a Hadoop cluster.
C) Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.
D) Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
4. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?
A) The new nodes cannot contain more than 8TB of disk space
B) The new nodes can contain any amount of disk space
C) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
D) The new nodes must all contain 4 x 2TB hard drives
5. 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) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
B) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C) Nn01 is fenced, and nn02 becomes the active NameNode
D) Nn01 is fenced, and nn01 becomes the active NameNode
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: C |
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