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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Explain the difference between NameNode

889

What other technologies have you used in hadoop sta ck?

934

what is difference between int and intwritable?

1419

What is Apache Hadoop YARN?

1420

What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

1068

What are channel selectors?

961

What are the stable versions of Hadoop?

959

Input Split & Record Reader and what they do?

975

what is the default replication factor in HDFS?

978

How indexing is done in HDFS?

1028

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

912

What are the two main components of ResourceManager?

1109

How will you make changes to the default configuration files?

912

What are the different types of Znodes?

948

How many instances of JobTracker can run on a Hadoop Cluser?

976

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Un-Answered Questions { Apache Hadoop }

How to resolve small file problem in hdfs?

932

How does an hadoop application look like or their basic components?

659

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

626

What is the problem with small files in Apache Hadoop?

735

What are the important differences between apache and hadoop?

669

How does NameNode tackle DataNode failures?

1111

Name the various types of lists supported by bootstrap.

620

Where do you specify the Mapper Implementation?

943

What is Hadoop streaming?

996

What is the main purpose of HDFS fsck command?

1730

What is the purpose of dfsadmin tool?

1200

What is a “Distributed Cache” in Apache Hadoop?

729

How to restart Namenode?

706

What is the difference between rdbms and hadoop?

605

Can hive run without hadoop?

638

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