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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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) 100 slave nodes
C) 10 slave nodes
D) 50 slave nodes

2. 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 10TB
B) Approximately 25TB
C) Approximately 33 TB
D) Approximately 100TB

3. In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

A) The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine which ran the map task
B) The hadoop framework holds the intermediate data in the task trackers memory until it is transferred to the reducers
C) The mapper transfer the intermediate data immediately to the reducers as it is generated by map task.
D) The mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers

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

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

5. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The third block will be 64MB
B) Each block will be replicated nine times
C) The file will consume 1152MB of space in the cluster
D) The third Initial block will be 44 MB
E) The file will be split into three blocks when initially written into the cluster
F) Two of the initial blocks will be 128MB
G) All three blocks will be 128MB
H) Each block will be replicated three times

Solutions: