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

1. You want to understand more about how users browse your public website, such as which pages they visit prior to placing an order. You have a farm of 200 web servers hosting your website. How will you gather this data for your analysis?

A) Ingest the server web logs into HDFS using Flume.
B) Sample the weblogs from the web servers, copying them into Hadoop using curl.
C) Write a MapReduce job, with the web servers for mappers, and the Hadoop cluster nodes for reduces.
D) Channel these clickstreams inot Hadoop using Hadoop Streaming.
E) Import all users' clicks from your OLTP databases into Hadoop, using Sqoop.

2. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
B) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
C) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
D) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.

3. Which one of the following statements is false about HCatalog?

A) Designed to be used by other programs such as Pig, Hive and MapReduce
B) Provides a shared schema mechanism
C) Exists as a subproject of Hive
D) Stores HDFS data in a database for performing SQL-like ad-hoc queries

4. In a MapReduce job, the reducer receives all values associated with same key. Which statement best describes the ordering of these values?

A) The values are in sorted order.
B) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
C) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the same ordering.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

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

A Pig JOIN statement that combined relations A by its first field and B by its second field would produce what output?

A) 2 cherry 2 cherry 3 orange 4 peach
B) 2 Jim Chris 2 3 Terry 3 4 Brian 4
C) 2 cherry Jim, Chris 3 orange Terry 4 peach Brian
D) 2 cherry Jim 2 2 cherry Chris 2 3 orange Terry 3 4 peach Brian 4

Solutions: