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Question ID 20599

What is the Secondary NameNode?

Option A

An alternate data channel for clients to reach HDFS, should the NameNode become too busy.

Option B

A process that performs a checkpoint operation on the files produced by the NameNode.

Option C

A data channel between the primary name node and the tertiary NameNode.

Option D

A process purely intended to perform backups of the NameNode.

Option E

 A standby NameNode, for high availability.

Correct Answer B
Explanation Reference: http://wiki.apache.org/hadoop/FAQ#What_is_the_purpose_of_the_secondary_name- node.3F (3.2)


Question ID 20600

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

Option A

Amount of memory on the NameNode.

Option B

Number of DataNodes.

Option C

Disk capacity of the NameNode.

Option D

Number of files that will be stored in HDFS.

Option E

Size of "typical" files that will be stored in HDFS.

Correct Answer C
Explanation Reference: http://stackoverflow.com/questions/10289349/hadoop-hdfs-blcok-size- considerations (see the answer)

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