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

1. What information is stored on disk on the NameNode? (Choose 4)

A) The status of the heartbeats of each DataNode.
B) An edit log of changes that have been made since the last backup of the NameNode.
C) A catalog of DataNodes and the blocks that are stored on them.
D) Names of the files in HDFS.
E) The directory structure of the files in HDFS.
F) File permissions of the files in HDFS.
G) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.

2. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 33 TB
B) Approximately 25TB
C) Approximately 10TB
D) Approximately 100TB

3. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
B) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
C) Reducers don't write blocks into HDFS
D) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.

4. You install Cloudera Manager on a cluster where each host has 1 GB of RAM. All of the services show their status as concerning. However, all jobs submitted complete without an error.
Why is Cloudera Manager showing the concerning status KM the services?

A) The slave nodes, haven't sent a heartbeat in 60 minutes
B) A slave node's disk ran out of space
C) The slave nodes are swapping.
D) DataNode service instance has crashed.

5. What is the Secondary NameNode?

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

Solutions: