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

1. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must not be formatted - - HDFS will format the filesystem automatically
B) They must be formatted as HDFS
C) They must be formatted as either ext3 or ext4
D) They may be formatted in nay Linux filesystem

2. Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workload consists of processor-intensive tasks.
B) When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.
C) When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.
D) When the typical workload generates a large amount of intermediate data, on the order of the input data itself.

3. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that there is consistent disk utilization across the DataNodes.
B) To ensure that there is capacity in HDFS tor additional data.
C) To improve data locality for MapReduce tasks.
D) To help HDFS deliver consistent performance under heavy loads.
E) To ensure that all blocks in the cluster are 128MB in size.

4. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The application reads the blocks directly from the DataNodes.
B) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
C) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.

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: