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Hadoop Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

 1 735

What MapReduce framework consists of?

 666

Can we submit the mapreduce job from slave node?

 739

How can we control particular key should go in a specific reducer?

 544

How can you add the arbitrary key-value pairs in your mapper?

 795

What is Reduce only jobs?

 1 577

What is a IdentityMapper and IdentityReducer in MapReduce ?

 521

Explain Working of MapReduce?

 559

Write a Mapreduce Program for Character Count ?

 601

how to proceed to write your first mapreducer program?

 932

How to set the number of reducers?

 912

Developing a MapReduce Application?

 540

Different ways of debugging a job in MapReduce?

 698

Explain the Reducer's reduce phase?

 590

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

 1 1785

Un-Answered Questions { Hadoop }

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

299

What is difference between coalesce and repartition?

156

Explain the Constituents of Apache ZooKeeper Architecture?

3

How many numbers of reducers run in Map-Reduce Job?

264

Why should we use ‘distinct’ keyword in Pig scripts?

204




Can you define yarn?

131

Give me the examples of Columnar database ?

171

Are spark dataframes distributed?

151

What is Immutable?

163

Give examples of the SerDe classes whihc hive uses to Serializa and Deserilize data?

313

Can impala be used for complex event processing?

30

Explain about the different types of trformations on dstreams?

140

What is salting in spark?

272

What is a rack awareness algorithm and why is it used in hadoop?

5

Elaborate on Identifiers?

81

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