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Category: Hadoop interview questions

hadoop interview questions. There is a collection of frequently asked hadoop interview questions…

What is HADOOP?

January 13, 2016 Gyantoday Hadoop interview questions Leave a comment

Hadoop is an open-source software framework. Hadoop was created by Doug Cutting and Mike Cafarella in 2005. Cutting, who was

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What is DataNode in hadoop?

January 12, 2016 Gyantoday Hadoop interview questions Leave a comment

A DataNode in hadoop stores data in the [Hadoop File System]. A functional file system has more than one DataNode,

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What is NameNode in hadoop?

January 12, 2016 Gyantoday Hadoop interview questions Leave a comment

The NameNode in hadoop is the centerpiece of an HDFS file system. It keeps the directory tree of all files

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What is JobTracker and TaskTracker in hadoop?

January 12, 2016 Gyantoday Hadoop interview questions Leave a comment

The main work of JobTracker and TaskTracker in hadoop is given below. JobTracker is a master which creates and runs

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What is InputSplit in hadoop?

January 10, 2016 Gyantoday Hadoop interview questions Leave a comment

InputSplit represents the data to be processed by an individual Mapper.  it presents a byte-oriented view on the input and is

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What is RecordReader in hadoop?

January 10, 2016 Gyantoday Hadoop interview questions Leave a comment

RecordReader reads <key, value> pairs from an InputSplit. Where key and value is- key – the key to read data

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What are the most common input formats in Hadoop? Which input format is default one?

January 10, 2016 Gyantoday Hadoop interview questions Leave a comment

These are the most common input formats in Hadoop. Text Input Format Key Value Input Format Sequence File Input Format

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What are the input formats in hadoop?

January 9, 2016 Gyantoday Hadoop interview questions Leave a comment

These are input formats in hadoop. CombineFileInputFormat, CombineSequenceFileInputFormat, CombineTextInputFormat, CompositeInputFormat, DBInputFormat, FileInputFormat, FixedLengthInputFormat, KeyValueTextInputFormat, MultiFileInputFormat, NLineInputFormat, Parser.Node, SequenceFileAsBinaryInputFormat, SequenceFileAsTextInputFormat, SequenceFileInputFilter,

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What is TextInputFormat and KeyValueInputFormat class?

January 9, 2016 Gyantoday Hadoop interview questions Leave a comment

In Hadoop TextInputFormat reads lines of text files and provides the offset of the line as key to the Mapper and

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What is a Combiner in hadoop?

January 9, 2016 Gyantoday Hadoop interview questions Leave a comment

The Combiner in hadoop is a ‘mini-reduce’ process which operates only on data generated by a mapper. The Combiner will

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