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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What is the best disk configuration for slave nodes in hadoop cluster where each node has 6x2TB drives?

A) Six separate volumes
B) A single Linux LVM (Logical volume Manager) volume
C) Three RAID 1 arrays
D) A RAID 5 array

2. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 10TB
B) Approximately 100TB
C) Approximately 33 TB
D) Approximately 25TB

3. Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?

A) Nodemanager
B) Applicationmaster
C) Resourcemanager
D) Namenode
E) Tasktracker
F) Datanode
G) Jobtracker
H) applicationmanager

4. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) The status of the heartbeats of each DataNode.
B) An edit log of changes that have been made since the last snapshot of the NameNode.
C) The directory structure of the files in HDFS.
D) A catalog of DataNodes and the blocks that are stored on them.
E) Names of the files in HDFS.
F) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
G) File permissions of the files in HDFS.

5. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) the jobtracker chooses the number based on no of available nodes
B) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files
C) The number mappers is equal to no of input splits calculated by client submitting
D) the developer specifies the number in the job configuration

Solutions: