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

1. Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)

A) Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.
B) Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.
C) HDFS is rack aware but MapReduce daemons are not.
D) Rack location is considered in the HDFS block placement policy.
E) Even for small clusters on a single rack, configuring rack awareness will improve performance.

2. When setting the HDFS block size, which of the following considerations is the least important?

A) Number of DataNodes.
B) Disk capacity of the NameNode.
C) Amount of memory on the NameNode.
D) Size of "typical" files that will be stored in HDFS.
E) Number of files that will be stored in HDFS.

3. Which two features does Kerberos security add to a Hadoop cluster?

A) Root access to the cluster for users hdfs and mapred but non-root acess clients
B) Encryption for data on disk ("at rest")
C) Encryption on all remote procedure calls (RPCs)
D) User authentication on all remote procedure calls (RPcs)
E) Authentication for user access to the cluster against a central server

4. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The DataNode JVM on one host is not active.
B) The HDFS cluster is in the safe mode.
C) One physical host crashed.
D) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.

5. 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 writes fails silently; no file is written, no error is reported.
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 file successfully writes to /users/reports/myreports/myreport.txt.
D) The client throws an exception.

Solutions: