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Hadoop Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

 1 1113

What MapReduce framework consists of?

 763

Can we submit the mapreduce job from slave node?

 840

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

 638

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

 986

What is Reduce only jobs?

 1 961

What is a IdentityMapper and IdentityReducer in MapReduce ?

 633

Explain Working of MapReduce?

 660

Write a Mapreduce Program for Character Count ?

 703

how to proceed to write your first mapreducer program?

 1025

How to set the number of reducers?

 1030

Developing a MapReduce Application?

 652

Different ways of debugging a job in MapReduce?

 799

Explain the Reducer's reduce phase?

 701

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

 1 2104

Un-Answered Questions { Hadoop }

What is Geo-Replication in Kafka?

624

Which are the three main hdfs-site.xml properties?

398

What is the advantage of hadoop over java serialization?

40

Explain why are replications critical in kafka?

306

Can you define yarn?

191




What are the different input sources for Spark Streaming?

225

What are consumers in kafka?

283

Mention what is the number of default partitioner in Hadoop?

428

What all tasks you can perform for managing services using Ambari service tab?

55

What is spark flatmap?

204

What is tungsten engine in spark?

216

What Is Difference Between Mapreduce and Pig ?

338

What is identity mapper and reducer? In which cases can we use them?

739

What do you mean by replication strategy?

48

Explain HCatLoader and HCatStorer APIs?

5

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