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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) DataNode
B) JobTracker
C) ApplicationMaster
D) ResourceManager
E) NameNode
F) NodeManager
G) TaskTracker

2. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A) The change is written to the edits file.
B) The metadata in RAM on the NameNode is flushed disk.
C) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
D) The metadata in RAM on the NameNode is updated.
E) The change is written to the NameNode disk.
F) The metadata in the RAM on the NameNode is flushed to disk.

3. What does each block of a file contain where it is return into HDFS?

A) Each block as a header containing metadata
B) Each block has a header and footer containing metadata
C) Each block writes a separate meta file containing information on the file name of which the block is a part
D) Each block contains only data from the file

4. What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?

A) They must all use the same filesystem as the namenode
B) They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
C) they must all be left as formatted raw disk, hadoop format them automatically
D) They can use different file system
E) They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS

5. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 100 slave nodes
B) 50 slave nodes
C) 100 slave nodes
D) 10 slave nodes

Solutions: