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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

What is a speculative execution in Apache Hadoop MapReduce?

793

What are the modes in which Apache Hadoop run?

800

What is Safemode in Apache Hadoop?

735

What are the different methods to run Spark over Apache Hadoop?

718

Why is Apache Spark faster than Apache Hadoop?

842

What does ‘jps’ command do?

694

Mention what is the use of Context Object?

721

What is commodity hardware?

659

Explain what is sqoop in Hadoop ?

725

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

736

Explain what is the purpose of RecordReader in Hadoop?

745

How to restart Namenode?

747

Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

762

Mention what are the data components used by Hadoop?

659

What does /etc /init.d do?

700

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Un-Answered Questions { Apache Hadoop }

Explain the master class and the output class do?

652

What is NoSQL?

922

What is a Task instance in Hadoop? Where does it run?1

853

What is HDFS High Availability?

962

What are the steps to submit a Hadoop job?

906

What Mapper does?

984

What are the additional benefits YARN brings in to Hadoop?

963

Explain the difference between NameNode

941

Explain the core components of hadoop?

661

What do shuffling do?

671

What is nlineoutputformat?

675

Is client the end user in HDFS?

978

What are the hadoop's three configuration files?

696

What do the master class and the output class do?

667

Explain the hadoop-core configuration?

693

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