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

1. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) Neither keys nor values are in any predictable order.
B) The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order
C) The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.
D) Both the keys and values passed to a reducer always appear in sorted order.

2. Consider the following two relations, A and B.

What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;

A) Option D
B) Option C
C) Option A
D) Option B

3. Which one of the following statements is true about a Hive-managed table?

A) Hive dynamically defines the schema of the table based on the format of the underlying data.
B) When the table is dropped, the underlying folder in HDFS is deleted.
C) Records can only be added to the table using the Hive INSERT command.
D) Hive dynamically defines the schema of the table based on the FROM clause of a SELECT query.

4. Which one of the following statements is true regarding a MapReduce job?

A) The reduce method is invoked once for each unique value
B) The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
C) The Mapper must sort its output of (key.value) pairs in descending order based on value
D) The default Hash Partitioner sends key value pairs with the same key to the same Reducer

5. Your cluster's HDFS block size in 64MB. You have directory containing 100 plain text files, each of which is 100MB in size. The InputFormat for your job is TextInputFormat. Determine how many Mappers will run?

A) 64
B) 200
C) 100
D) 640

Solutions: