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

1. A NameNode in Hadoop 2.0 manages ______________.

A) An arbitrary number of namespaces
B) A single namespace
C) No namespaces
D) Two namespaces: an active namespace and a backup namespace

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

A) 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.
B) 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).
C) As many final key-value pairs as desired, but they must have the same type as the intermediate
key-value pairs.
D) One final key-value pair per key; no restrictions on the type.
E) One final key-value pair per value associated with the key; no restrictions on the type.

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

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

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

A) It accepts a list 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 single 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.

5. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The output of each reducer is only the age column
B) The output is guaranteed to be a single file with all the data sorted by age
C) Each reducer generates a file sorted by age
D) The SORT BY command causes only one reducer to be used

Solutions: