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

1. 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 10TB
C) Approximately 25TB
D) Approximately 100TB

2. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) 10
B) We cannot say; the number of Mappers is determined by the developer
C) 1
D) 30

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) 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.
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) 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.
D) 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.

4. When determining the most appropriate ratio of processor cores to disk drives for a Hadoop cluster, what are the considerations?

A) Processor core counts and workload type, the ratio doesn't matter
B) Disk drives per core without consideration to workload types
C) Disk drives per machine, nothing else matters.
D) Disk drives per core and workload types
E) Processors and disk drives per machine, the workload doesn't matter

5. 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 nine blocks and write them randomly to nodes throughout the cluster.
B) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) Reducers don't write blocks into HDFS
D) 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.

Solutions: