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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
B) Keys are presented to a reducer in random order; values for a given key are not sorted.
C) Keys are presented to reducer in sorted order; values for a given key are not sorted.
D) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.

2. For each intermediate key, each reducer task can emit:

A) As many final key-value pairs as desired, but they must have the same type as the intermediate
key-value pairs.
B) One final key-value pair per value associated with the key; no restrictions on the type.
C) One final key-value pair per key; no restrictions on the type.
D) As many final key-value pairs as desired, as long as all the keys have the same type and all the values
have the same type.
E) As many final key-value pairs as desired. There are no restrictions on the types of those key-value
pairs (i.e., they can be heterogeneous).

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

A) The default Hash Partitioner sends key value pairs with the same key to the same Reducer
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 reduce method is invoked once for each unique value

4. 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) Both the keys and values passed to a reducer always appear in sorted order.
C) The keys given to a reducer are in sorted order but the values associated with each key are in no
predictable order
D) The keys given to a reducer aren't in a predictable order, but the values associated with those keys
always are.

5. You have the following key-value pairs as output from your Map task:

A) Six
B) Two
C) Four
D) Five
E) One
F) Three

Solutions: