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Cloudera CCA-470 Exam Syllabus Topics:

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

Question 1

Which three processes does HDFS High Availability (HA) enable on your cluster?

A. Shut one NameNode down for maintenance without halting the cluster
B. Write data to two clusterssimultaneously
C. Automatically 'fail over' between NameNodes if one goes down
D. Manually 'fail over' between NameNodes
E. Configure unlimited hot standby NameNode.

Question 2

Identify two features/issues that MapReduce v2 (MRv2/YARN) is designed to address:

A. Resource pressure on the JobTrackr
B. Standardize on a single MapReduce API.
C. Reduce complexity of the MapReduce APIs.
D. Single point of failure in the NameNode.
E. Ability to run frameworks other than MapReduce, such as MPI.
F. HDFS latency.

Question 3

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

Question 4

Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A. nn02 becomes the standby NameNode and nn02 becomes the active NameNode
B. Nn01 is fenced, and nn01 becomes the active NameNode
C. Nn01 is fenced, and nn02 becomes the active NameNode
D. Nn01 becomes the standby NameNode and nn02 becomes the active NameNode

Question 5

You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
B. Decrease the io.sort.mb value below 100M
C. Increase the IO.sort.mb as high you can, as close to 1GB as possible.
D. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.

Solutions: