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

1. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set by the developer.
B) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
C) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
D) It is set by the JobTracker based on the amount of intermediate data.

2. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
B) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
C) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
D) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.

3. 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 4 x 2TB hard drives
C) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
D) The new nodes cannot contain more than 8TB of disk space

4. 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.

A) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
B) You must modify the configuration files on only one of the DataNode machine
C) You must restart the NameNode daemon to apply the changes to the cluster
D) You must modify the configuration files on each of the six DataNode machines.
E) You must restart all six DataNode daemons to apply the changes to the cluster.
F) You don't need to restart any daemon, as they will pick up changes automatically.

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

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

Solutions: