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Question ID 12477

What is 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 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 12478

Which best describes how TextInputFormat processes input files and line breaks?

Option A

Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.

Option B

 Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.

Option C

The input file is split exactly at the line breaks, so each RecordReader will read a series of complete lines.

Option D

 Input file splits may cross line breaks. A line that crosses file splits is ignored.

Option E

Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.

Correct Answer A
Explanation Reference: How Map and Reduce operations are actually carried out

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