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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

How Mapper is instantiated in a running job?

951

Where do you specify the Mapper Implementation?

942

What is the meaning of speculative execution in Hadoop? Why is it important?

1017

What is the InputFormat ?

965

Command to format the NameNode?

891

Who is a 'user' in HDFS?

847

What is the meaning of the term "non-DFS used" in Hadoop web-console?

1245

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

973

What is DistributedCache and its purpose?

871

What is HDFS ? How it is different from traditional file systems?

886

What is HDFS Block size? How is it different from traditional file system block size?

1 1383

How you can contact your client everyday ?

927

What is Input Split in hadoop?

921

What is 'Key value pair' in HDFS?

907

How to keep HDFS cluster balanced?

1054

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Un-Answered Questions { Apache Hadoop }

What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

626

Can we call vms as pseudos?

623

Where is the Mapper Output stored?

1337

What is crontab? Explain with suitable example?

998

What do you know about keyvaluetextinputformat?

564

What is yarn in hadoop?

640

Can NameNode and DataNode be a commodity hardware?

1642

How client application interacts with the NameNode?

915

What is the Use of SSH in Hadoop ?

928

Is it possible to provide multiple inputs to hadoop? If yes, explain.

619

Why are the number of splits equal to the number of maps?

912

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

1280

What are the functionalities of jobtracker?

639

What is version-id mismatch error in hadoop?

1020

How to keep HDFS cluster balanced?

1054

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