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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A) One active NameNode and one Standby NameNode
B) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
C) Two active NameNodes and one Standby NameNode
D) Two active NameNodes and two Standby NameNodes

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

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

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

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

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

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

5. What metadata is stored on a DataNode when a block is written to it?

A) None. Only the block itself is written.
B) Node location of each block belonging to the same namespace.
C) Information on the file's location in HDFS.
D) Checksums for the data in the block, as a separate file.

Solutions: