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

1. What is the Secondary NameNode?

A) A process purely intended to perform backups of the NameNode.
B) A data channel between the primary name node and the tertiary NameNode.
C) A process that performs a checkpoint operation on the files produced by the NameNode.
D) A standby NameNode, for high availability.
E) An alternate data channel for clients to reach HDFS, should the NameNode become too busy.

2. What would be a reasonable configuration of disk drives in a Hadoop datanode?

A) 48 1.5TB disk drives in a JBOD configuration
B) Four 1TB disk drives in a RAID configuration
C) 48 1.5 TB disk drives in a RAID configuration
D) Four 1TB disk drives in a JBOD configuration
E) One 1TB disk drive

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

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

5. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Client application B must wait until the entire file has been written, and will then read its entire contents.
B) Client application on B can read the 300MB that has been written so far.
C) Client application B returns an error
D) Application B can read 256MB of the file

Solutions: