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

1. When setting the HDFS block size, which of the following considerations is the least important?

A) Number of files that will be stored in HDFS.
B) Amount of memory on the NameNode.
C) Size of "typical" files that will be stored in HDFS.
D) Disk capacity of the NameNode.
E) Number of DataNodes.

2. What's the relationship between JobTrackers and TaskTrackers?

A) Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.
B) The JobTracker runs on a single master node, but forks a separate instance of itself for every client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
C) The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A JobTracker runs on every slave node and is responsible for managing map and reduce tasks.
D) The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.

3. Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?

A) After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.
B) The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.
C) The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.
D) The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.

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

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

5. Which of the following describe the functions of a scheduling algorithm? (Choose 4)

A) Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.
B) Reduce job latencies in an environment with multiple jobs of different sizes.
C) Support the implementation of service-level agreements for multiple cluster users.
D) Allow multiple users to share clusters in a predictable, policy-guided manner.
E) Run jobs at periodic times of the day.
F) Reduce the total amount of computation necessary to complete a job.

Solutions: