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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

2. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must be formatted as HDFS
B) They must be formatted as either ext3 or ext4
C) They may be formatted in nay Linux filesystem
D) They must not be formatted - - HDFS will format the filesystem automatically

3. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy physical blocks from the source to the target destination in your cluster.
B) Use distcp to copy data between directories inside the same cluster.
C) Use distcp to copy HBase table files.
D) Use distcp to run an internal MapReduce job to copy files.
E) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.

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

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

5. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) JobTracker
B) ApplicationMaster
C) NodeManager
D) ResourceManager
E) TaskTracker
F) NameNode
G) DataNode

Solutions: