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WithoutBook LIVE Mock Interviews Hadoop Related interview subjects: 74

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Ques 1

What is the SequenceFileInputFormat in Hadoop?

In Hadoop, SequenceFileInputFormat is used to read files in sequence. It is a specific compressed binary file format which passes data between the output of one MapReduce job to the input of some other MapReduce job.

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Ques 3

What is the use of RecordReader in Hadoop?

InputSplit is assigned with a work but doesn't know how to access it. The record holder class is totally responsible for loading the data from its source and convert it into keys pair suitable for reading by the Mapper. The RecordReader's instance can be defined by the Input Format.

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