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Question ID 12525	Indentify which best defines a SequenceFile?
Option A	A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects
Option B	A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous Writable objects
Option C	A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
Option 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 the same type.
Correct Answer	D

Explanation Explanation: SequenceFile is a flat file consisting of binary key/value pairs. There are 3 different SequenceFile formats: Uncompressed key/value records. Record compressed key/value records - only 'values' are compressed here. Block compressed key/value records - both keys and values are collected in 'blocks' separately and compressed. The size of the 'block' is configurable. Reference: http://wiki.apache.org/hadoop/SequenceFile

Question ID 12526	You have the following key-value pairs as output from your Map task: (the, 1) (fox, 1) (faster, 1) (than, 1) (the, 1) (dog, 1) How many keys will be passed to the Reducers reduce method?
Option A	Six
Option B	Five
Option C	Four
Option D	Two
Option E	One
Option F	Three
Correct Answer	B

Explanation Explanation: Only one key value pair will be passed from the two (the, 1) key value pairs.

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