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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which of the following best describes the map method input and output?

A) It accepts a list of key-value pairs as input hut run emit only one key value pair as output.
B) It accepts a single key-value pair as input and can emit only one key-value pair as output.
C) It accepts a single key-value pair as input and can emit any number of key-value pairs as output, including zero.
D) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output

2. 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 11 TB
B) about 5 TB
C) about 10 TB
D) about 3 TB

3. In a MapReduce job, you want each of you input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?

A) Increase the parameter that controls minimum split size in the job configuration.
B) Set the number of mappers equal to the number of input files you want to process.
C) Write a custom FileInputFormat and override the method isSplittable to always return false.
D) Write a custom MapRunner that iterates over all key-value pairs in the entire file.

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

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

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

Solutions: