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

2. Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?

A) The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode
B) The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
C) the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):

A) The NameNode requires more memory and no disk drives.
B) The NameNode requires more memory but less disk capacity.
C) The NameNode and DataNodes should the same hardware configuration.
D) The NameNode requires less memory and less disk capacity than the DataNodes.
E) The NameNode requires more memory and requires greater disk capacity than the DataNodes.

4. 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 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.
C) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
D) 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.

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

Solutions: