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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. Which best describes what the map method accepts and emits?

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

2. You wrote a map function that throws a runtime exception when it encounters a control character in input data. The input supplied to your mapper contains twelve such characters totals, spread across five file splits. The first four file splits each have two control characters and the last split has four control characters.
Indentify the number of failed task attempts you can expect when you run the job with mapred.max.map.attempts set to 4:

A) You will have forty-eight failed task attempts
B) You will have five failed task attempts
C) You will have seventeen failed task attempts
D) You will have twelve failed task attempts
E) You will have twenty failed task attempts

3. Which of the following tool was designed to import data from a relational database into HDFS?

A) Sqoop
B) HCatalog
C) Ambari
D) Flume

4. You want to perform analysis on a large collection of images. You want to store this data in HDFS and process it with MapReduce but you also want to give your data analysts and data scientists the ability to process the data directly from HDFS with an interpreted high-level programming language like Python. Which format should you use to store this data in HDFS?

A) XML
B) SequenceFiles
C) Avro
D) HTML
E) JSON
F) CSV

5. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

A) Make a directory /foo/bar
B) Read a file /foo/bar
C) Delete a directory /foo/bar
D) List a directory /foo

Solutions: