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

1. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A) To help HDFS deliver consistent performance under heavy loads.
B) To ensure that there is capacity in HDTS for additional data.
C) To ensure that all blocks in the cluster are 128MB in size.
D) To ensure that there is consistent disk utilization across the DataNodes.
E) To improve data locality for MapReduce tasks.

2. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode requires more memory but less disk capacity.
B) The NameNode requires more memory and no disk drives.
C) The NameNode requires less memory and fewer number of disk drives than the DataNodes.
D) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
E) The NameNode and DataNodes should have the same hardware configuration.

3. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
B) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
C) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
D) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.

4. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) One copy of the block is written to a node in each of three racks
B) All three of the block are written to nodes on the same rack
C) Because there are seven racks the block is written to a node on each rack
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

5. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) An entire rack fails.
B) Multiple racks simultaneously fail.
C) All DataNodes simultaneously fail.
D) Ten percent of DataNodes simultaneously fail.
E) Seventy percent of DataNodes simultaneously fail.

Solutions: