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

2. Which TWO of the following statements are true regarding Hive? Choose 2 answers

A) Useful for data analysts familiar with SQL who need to do ad-hoc queries
B) Is a relational database
C) Allows you to define a structure for your unstructured Big Data
D) Offers real-time queries and row level updates

3. What are the TWO main components of the YARN ResourceManager process? Choose 2 answers

A) Job Tracker
B) Applications Manager
C) Scheduler
D) Task Tracker

4. You want to count the number of occurrences for each unique word in the supplied input data. You've decided to implement this by having your mapper tokenize each word and emit a literal value 1, and then have your reducer increment a counter for each literal 1 it
receives. After successful implementing this, it occurs to you that you could optimize this by specifying a combiner. Will you be able to reuse your existing Reduces as your combiner in this case and why or why not?

A) Yes, because Java is a polymorphic object-oriented language and thus reducer code can be reused as a combiner.
B) No, because the Reducer and Combiner are separate interfaces.
C) No, because the sum operation in the reducer is incompatible with the operation of a Combiner.
D) No, because the Combiner is incompatible with a mapper which doesn't use the same data type for both the key and value.
E) Yes, because the sum operation is both associative and commutative and the input and output types to the reduce method match.

5. Given the following Hive commands:

Which one of the following statements Is true?

A) The file mydata.txt is copied to a subfolder of /apps/hive/warehouse
B) The file mydata.txt is moved to a subfolder of /apps/hive/warehouse
C) The file mydata.txt does not move from Its current location in HDFS
D) The file mydata.txt is copied into Hive's underlying relational database 0.

Solutions: