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

Explain the difference between mapreduce engine and hdfs cluster?

148

Explain the difference between an hdfs block and input split?

What do you know about sequencefileinputformat?

670

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

668

Why the name ‘hadoop’?

662

What do you know about nlineoutputformat?

738

How can we change the split size if our commodity hardware has less storage space?

714

How is hadoop different from other data processing tools?

713

What happens in a textinputformat?

714

Can you explain how do ‘map’ and ‘reduce’ work?

778

Can we call vms as pseudos?

694

What do the master class and the output class do?

707

What does job conf class do?

708

What do you know about keyvaluetextinputformat?

641

Define a namenode?

708

Un-Answered Questions { Hadoop }

What is a yaml file in cassandra?

What is mapper in map reduce?

699

How to set mappers and reducers for Hadoop jobs?

663

Name the management tools in Cassandra?

What the information segments utilized by hadoop are?

450

How to change Replication Factor For below cases ?

1152

How can I improve my spark performance?

305

How Spark uses Hadoop?

314

Name a few import control commands. How can Sqoop handle large objects?

What is a generic UDF in the hive?

799

What are the types of transformation in RDD in Apache Spark?

336

What is the difference between map and flatmap?

326

What are producers in kafka?

554

How can you launch Spark jobs inside Hadoop MapReduce?

333

Explain the tajo architecture?

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