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 1757

What MapReduce framework consists of?

1065

Can we submit the mapreduce job from slave node?

1060

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

872

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

1394

What is Reduce only jobs?

1 1629

What is a IdentityMapper and IdentityReducer in MapReduce ?

913

Explain Working of MapReduce?

928

Write a Mapreduce Program for Character Count ?

1012

how to proceed to write your first mapreducer program?

1314

How to set the number of reducers?

1327

Developing a MapReduce Application?

911

Different ways of debugging a job in MapReduce?

1067

Explain the Reducer's reduce phase?

1017

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

1 2686

Un-Answered Questions { Hadoop }

What is the difference between Cassandra and Hadoop ?

Hadoop sqoop is which type of tool?

what are the main components of cassandra data model?

Which one will you choose for a project –Hadoop MapReduce or Apache Spark?

291

Explain the concept of Leader and Follower?

557

Can you use Spark to access and analyse data stored in Cassandra databases?

355

What are the views in Hive?

628

What is the man difference between hbase and hive?

629

What do you mean by meta information in hdfs?

Compare Hadoop and Spark?

311

Explain what is a task tracker in hadoop?

400

what is (HS2) HiveServer2?

644

What is the difference between TextinputFormat and KeyValueTextInputFormat class?

475

Mention the difference between hbase and relational database?

160

Define lzo?

194

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