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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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) Reducers don't write blocks into HDFS
B) 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.
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.

2. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
B) The file successfully writes to /users/reports/myreports/myreport.txt.
C) The file writes fails silently; no file is written, no error is reported.
D) The client throws an exception.

3. 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 100TB
B) Approximately 25TB
C) Approximately 33 TB
D) Approximately 10TB

4. Which two occur when individual blocks are returned to DATANODE on a cluster local filesystem?

A) The datanode updates it's log of checkum verification
B) A metadata file is return to the datanode containing all the other node locations in the namespace
C) A metadata file is written to the datanode containing the checksums for each block
D) The datanode writes a metadata file with the name of the file the block is associated with
E) The datanode runs a block scanner datablock scanner to verify the return blocks.

5. 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 and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
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 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.
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.

Solutions: