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Question 8

What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes. (Choose two)

Options:

You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes

You must modify the configuration files on each of the DataNodes machines

You don’t need to restart any daemon, as they will pick up changes automatically

You must restart the NameNode daemon to apply the changes to the cluster

You must restart all six DatNode daemon to apply the changes to the cluster

Question 9

Your cluster has the following characteristics:

A rack aware topology is configured and on
Replication is set to 3
Cluster block size is set to 64MB

Which describes the file read process when a client application connects into the cluster and requests a 50MB file?

Options:

The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of hadoop’s speculative execution framework.

The client queries the NameNode for the locations of the block, and reads from the first location in the list it receives.

The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from any given time.

The client queries the NameNode which retrieves the block from the nearest DataNode to the client then passes that block back to the client.

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PDF CCA-500 Study Guide,

Exam Code: CCA-500

Exam Name: Cloudera Certified Administrator for Apache Hadoop (CCAH)

Last Update: Dec 22, 2024

Questions: 60