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?

823

What are the modes in which Apache Hadoop run?

831

What is Safemode in Apache Hadoop?

774

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

760

Why is Apache Spark faster than Apache Hadoop?

876

What does ‘jps’ command do?

722

Mention what is the use of Context Object?

749

What is commodity hardware?

708

Explain what is sqoop in Hadoop ?

770

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

778

Explain what is the purpose of RecordReader in Hadoop?

783

How to restart Namenode?

795

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

798

Mention what are the data components used by Hadoop?

690

What does /etc /init.d do?

733

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Un-Answered Questions { Apache Hadoop }

What is a Secondary Namenode? Is it a substitute to the Namenode?

1063

Define fault tolerance?

695

Which is the best hadoop certification?

709

Explain what if rack 2 and datanode fails?

672

How did you debug your Hadoop code ?

1410

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

705

How hdfa differs with nfs?

777

how can we change Replication Factor?

1069

What is a “Distributed Cache” in Apache Hadoop?

816

Explain the use of tasktracker in the hadoop cluster?

676

Where do you specify the Mapper Implementation?

1050

How can we look for the namenode in the browser?

751

What is zookeeper in hadoop?

686

Can the balancer be run while Hadoop is in use?

1011

explain Metadata in Namenode?

979

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