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

1. Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

A) The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.
B) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
C) The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
D) The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.

2. Which daemon spawns child JVMs to perform MapReduce processing?

A) Secondary NameNode
B) TaskTracker
C) NameNode
D) DataNode
E) JobTracker

3. You have a cluster running with the Fair Scheduler enabled and configured. You submit multiple jobs to cluster. Each job is assigned to a pool. How are jobs scheduled? (Choose 2)

A) Each pool's share of task slots remains static within the execution of any individual job.
B) Each pool's share of task slots may change throughout the course of job execution.
C) Each pool gets 1/M of the total available task slots, where M is the number of nodes in the cluster
D) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints).
E) Each pool gets 1/N of the total available task slots, where N is the number of jobs running on the cluster.
F) Pools are assigned priorities. Pools with higher priorities are executed before pools with lower priorities.

4. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) We cannot say; the number of Mappers is determined by the developer
B) 1
C) 30
D) 10

5. 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) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) Reducers don't write blocks into HDFS
D) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.

Solutions: