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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which happens if the NameNode crashes?

A) The Secondary NameNode seamlessly takes over and there is no service interruption.
B) HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
C) HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
D) HDFS becomes unavailable until the NameNode is restored.

2. You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node will Hadoop first attempt to run the Map task?

A) The node with the most free local disk space
B) The node with the most memory
C) The node with the lowest system load
D) The node on which this InputSplit is stored

3. Given a Mapper, Reducer, and Driver class packaged into a jar, which is the correct way of submitting the job to the cluster?

A) jar MyJar.jar MyDriverClass inputdir outputdir
B) jar MyJar.jar
C) hadoop jar class MyJar.jar MyDriverClass inputdir outputdir
D) hadoop jar MyJar.jar MyDriverClass inputdir outputdir

4. Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A) about 3 TB
B) about 5 TB
C) about 11 TB
D) about 10 TB

5. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?

A) 100
B) 200
C) 640
D) 64

Solutions: