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

1. What do you need to do when adding new slave nodes to a cluster?

A) add the new node's DNS name to the conf/slaves file on the master node.
B) Increase the value of dfs.number.of.nodes in hdfs-site.xml.
C) Add a new entry to /etc/slavenodes on the NameNode host.
D) Restart the NameNode daemon.
E) Halt and resubmit any running MapReduce jobs to guarantee correctness.

2. Choose three reasons why should you run the HDFS balancer periodically?

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

3. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor processor utilization.
B) Ability to monitor NameNode memory usage.
C) Ability to monitor the amount of free space on HDFS.
D) Ability to monitor free task slots.
E) Ability to monitor number of files in HDFS.

4. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes can contain any amount of disk space
B) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
C) The new nodes cannot contain more than 8TB of disk space
D) The new nodes must all contain 4 x 2TB hard drives

5. Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workload generates a large amount of intermediate data, on the order of the input data itself.
B) When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.
C) When the typical workload consists of processor-intensive tasks.
D) When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.

Solutions: