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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which of the following statements most accurately describes the relationship between MapReduce and Pig?

A) Pig provides no additional capabilities to MapReduce. Pig programs are executed as MapReduce jobs via the Pig interpreter.
B) Pig provides additional capabilities that allow certain types of data manipulation not possible with MapReduce.
C) Pig provides the additional capability of allowing you to control the flow of multiple MapReduce jobs.
D) Pig programs rely on MapReduce but are extensible, allowing developers to do special-purpose processing not provided by MapReduce.

2. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
B) Each slave node runs a TaskTracker and a DataNode daemon.
C) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
D) Each slave node runs a JobTracker and a DataNode daemon.
E) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.

3. You have an employee who is a Date Analyst and is very comfortable with SQL. He would like to run ad-hoc analysis on data in your HDFS duster. Which of the following is a data warehousing software built on top of Apache Hadoop that defines a simple SQL-like query language well-suited for this kind of user?

A) Sqoop
B) Hive
C) Oozie
D) Pig
E) Hadoop Streaming
F) Hue
G) Flume

4. You write a MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat and the IdentityReducer: the mapper applies a regular expression over input values and emits key-value pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reducers to zero.

A) With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With one reducer, instances of matching patterns stored in multiple files on HDFS.
B) With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of matching patterns are stored in a single file on HDFS.
C) There is no difference in output between the two settings.
D) With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one reducer, all instances of matching patterns are gathered together in one file on HDFS.

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) 640
B) 200
C) 64
D) 100

Solutions: