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

1. Which two features does Kerberos security add to a Hadoop cluster?

A) User authentication on all remote procedure calls (RPcs)
B) Root access to the cluster for users hdfs and mapred but non-root acess clients
C) Authentication for user access to the cluster against a central server
D) Encryption for data on disk ("at rest")
E) Encryption on all remote procedure calls (RPCs)

2. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) Node Manager
B) DataNode
C) Application Manager
D) Resource Manager
E) NameNode
F) Secondary NameNode

3. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The file will consume 1152MB of space in the cluster
B) Each block will be replicated three times
C) All three blocks will be 128MB
D) The third Initial block will be 44 MB
E) Each block will be replicated nine times
F) Two of the initial blocks will be 128MB
G) The file will be split into three blocks when initially written into the cluster
H) The third block will be 64MB

4. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
B) Reducers don't write blocks into HDFS
C) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
D) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.

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

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

Solutions: