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's the best way to copy files between HDFS clusters?

1358

Can Apache Kafka be used without Zookeeper?

1035

What is Your Cluster size ?

1439

What is the default block size in hdfs?

1041

What are active and passive "NameNodes"?

1465

What are combiners and its purpose?

931

On what basis Namenode will decide which datanode to write on?

1264

Can Hadoop be compared to NOSQL database like Cassandra?

910

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

1032

What is the difference between SQL and NoSQL?

1077

What are the additional benefits YARN brings in to Hadoop?

963

what are the steps involved in decommissioning removing

1015

What is the process to change the files at arbitrary locations in HDFS?

1418

What is difference between split and block in hadoop?

1396

How many JVMs run on a slave node?

1044

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Un-Answered Questions { Apache Hadoop }

Can the balancer be run while Hadoop is in use?

975

What is the difference between a Hadoop and Relational Database and Nosql?

1076

Explain how is hadoop different from other data processing tools?

731

What exactly is hadoop?

691

What is a namenode? How many instances of namenode run on a hadoop cluster?

643

What is 'Key value pair' in HDFS?

960

Explain the wordcount implementation via hadoop framework ?

724

What do you know about sequencefileinputformat?

632

What is rack-aware replica placement policy?

1026

What is Hadoop Custom partitioner ?

1001

What is the purpose of dfsadmin tool?

1246

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

668

Have you ever used Counters in Hadoop. Give us an example scenario?

1063

What if rack 2 and datanode fails?

1060

What are the Basics of Hadoop?

930

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