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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

A) The mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers
B) The hadoop framework holds the intermediate data in the task trackers memory until it is transferred to the reducers
C) The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine which ran the map task
D) The mapper transfer the intermediate data immediately to the reducers as it is generated by map task.

2. 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 10TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 100TB

3. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) ApplicationMasterService
B) ApplicationMaster
C) ResourceManager
D) JobTracker
E) NodeManager
F) TaskTracker

4. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be run as a MapReduce job
B) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
C) The file cannot be deleted by anyone
D) The file's contents can be modified by the owner, but no-one else
E) The file cannot be deleted by anyone but the owner

5. Your developers request that you enable them to use Hive on your Hadoop cluster. What do install and/or configure?

A) Install the Hive interpreter on the client machines and all nodes on the cluster
B) Install the Hive interpreter on the master node running the JobTracker, and configure a shared remote Hive Metastore.
C) Install the Hive Interpreter on the client machines and all the slave nodes, and configure a shared remote Hive Metastore.
D) Install the Hive interpreter on the client machines only, and configure a shared remote Hive Metastore.

Solutions: