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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workloads consists of processor-intensive tasks.
B) When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.
C) When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.
D) When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.

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

3. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
B) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
C) After a period of time, the TaskTracker will kill the Map Task.
D) The job will immediately fail.

4. A slave node in your cluster has 24GB of Ram and 12 physical processor cores on hyper threading-enabled processor. You set the value of mapped. child.java.opts to -Xmx1G, and the value of mapred.tasktracker.map.tasks.maximum to 12. What is the appropriate value to set for mapred.Tastracker.reduce.tasks.maximum?

A) 20
B) 16.
C) 24
D) 2
E) 12
F) 6

5. MapReduce V2 (MRv2/YARN) splits which two major functions of the jobtracker into separate daemons?

A) Launching tasks
B) MapReduce metric reporting
C) Health status check (heartbeats)
D) Job scheduling/monitoring
E) Managing tasks
F) Job coordination between the resource manager and the node manager
G) Managing file system metadata
H) Resource management

Solutions: