Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

What is MapReduce?

1 1841

What MapReduce framework consists of?

1094

Can we submit the mapreduce job from slave node?

1104

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

913

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

1422

What is Reduce only jobs?

1 1707

What is a IdentityMapper and IdentityReducer in MapReduce ?

943

Explain Working of MapReduce?

969

Write a Mapreduce Program for Character Count ?

1047

how to proceed to write your first mapreducer program?

1342

How to set the number of reducers?

1361

Developing a MapReduce Application?

963

Different ways of debugging a job in MapReduce?

1105

Explain the Reducer's reduce phase?

1052

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

1 2768

Un-Answered Questions { Hadoop }

What is namenode?

482

What are configuration files in Hadoop?

521

Explain HDFS “Write once Read many” pattern?

What are the advantages of using mapreduce with hadoop?

590

What is the full form of fsck?

702

Explain Spark join() operation?

286

What is a Backup node in Hadoop?

559

Can you explain spark core?

264

Explain mappartitions() and mappartitionswithindex()?

421

Explain how do ‘map’ and ‘reduce’ works?

736

Explain the Scope operators used in hbase?

182

What are different types of filesystem?

1141

What are the destination types allowed in sqoop import command?

What are the independent extensions that contributed to the ambari codebase?

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

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