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

1. To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the best way to accomplish this?

A) Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.
B) Place the data file in the DataCache and read the data into memory in the configure method of the mapper.
C) Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.
D) Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.

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

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

3. Which one of the following statements describes a Hive user-defined aggregate function?

A) Operates on a single input row and produces a single row as output
B) Operates on multiple input rows and produces a table as output
C) Operates on multiple input rows and creates a single row as output
D) Operates on a single input row and produces a table as output

4. Which one of the following Hive commands uses an HCatalog table named x?

A) Hive commands cannot reference an HCatalog table
B) SELECT x.-FROM org.apache.hcatalog.hive.HCatLoader('x');
C) SELECT * FROM org.apache.hcatalog.hive.HCatLoader('x');
D) SELECT * FROM x;

5. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to a different Writable object time.
B) It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.
C) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) It returns a reference to the same Writable object each time, but populated with different data.
E) It returns a reference to a Writable object from an object pool.

Solutions: