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

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

2. You are running a Hadoop cluster with all monitoring facilities properly configured. Which scenario will go undetected?

A) A DataNode is disconnected from the cluster.
B) HDFS is almost full.
C) The NameNode goes down.
D) MapReduce jobs that are causing excessive memory swaps.
E) Map or reduce tasks that are stuck in an infinite loop.

3. 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 Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
D) 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.

4. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) 10
B) We cannot say; the number of Mappers is determined by the developer
C) 1
D) 30

5. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the Cluster will all be multiples of 64M
B) The block size of files in the cluster will all be the exactly 64MB.
C) The block size of files in the cluster can be determined as the block is written.
D) The block size of files in the duster will all at least be 64MB.

Solutions: