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

1. What would be a reasonable configuration of disk drives in a Hadoop datanode?

A) Four 1TB disk drives in a RAID configuration
B) 48 1.5 TB disk drives in a RAID configuration
C) One 1TB disk drive
D) Four 1TB disk drives in a JBOD configuration
E) 48 1.5TB disk drives in a JBOD configuration

2. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file writes fails silently; no file is written, no error is reported.
B) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
C) The file successfully writes to /users/reports/myreports/myreport.txt.
D) The client throws an exception.

3. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must modify the configuration files on each of the six DataNode machines.
B) You must modify the configuration files on only one of the DataNode machine
C) You must restart the NameNode daemon to apply the changes to the cluster
D) You don't need to restart any daemon, as they will pick up changes automatically.
E) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
F) You must restart all six DataNode daemons to apply the changes to the cluster.

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

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

5. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job A gets submitted, it consumes all the task slots.
B) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
C) When job B gets submitted, job A has to finish first, before job B can get scheduled.
D) When job A gets submitted, it doesn't consume all the task slots.

Solutions: