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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

A) Hadoop01 becomes inactive and hadoop02 becomes the active namenode
B) Hadoop01 is fenced, and hadoop02 becomes the active namenode
C) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode
D) Hadoop02 is fenced, and hadoop01 becomes active namenode

2. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) the master nodes requires less memory and fewer number disk drives than the slave nodes
B) The master nodes requires more memory but less disk capacity
C) The master nodes require more memory and greater disk capacity then the slave nodes
D) The master and slave nodes should have the same hardware configuration
E) The master nodes requires more memory and no disk drives

3. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be deleted by anyone
B) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
C) The file cannot be run as a MapReduce job
D) The file's contents can be modified by the owner, but no-one else
E) The file cannot be deleted by anyone but the owner

4. What metadata is stored on a DataNode when a block is written to it?

A) Node location of each block belonging to the same namespace.
B) Information on the file's location in HDFS.
C) None. Only the block itself is written.
D) Checksums for the data in the block, as a separate file.

5. What does each block of a file contain where it is return into HDFS?

A) Each block has a header and footer containing metadata
B) Each block writes a separate meta file containing information on the file name of which the block is a part
C) Each block as a header containing metadata
D) Each block contains only data from the file

Solutions: