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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2771

What are the functions of NameNode?

1 1990

How to configure hadoop to reuse JVM for mappers?

1201

How to resolve IOException: Cannot create directory

1016

How to change replication factor of files already stored in HDFS?

1003

Which one is default InputFormat in Hadoop ?

1 2345

shouldn't DFS be able to handle large volumes of data already?

1067

what is a datanode?

923

How does NameNode tackle DataNode failures?

1168

What is InputSplit and RecordReader?

960

What is the purpose of dfsadmin tool?

1246

How can you connect an application

1028

how is a file of the size 1 GB uncompressed

931

Is map like a pointer?

917

What is the default replication factor?

988

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Un-Answered Questions { Apache Hadoop }

Can you tell us more about ssh?

716

How can I restart namenode?

720

Why is hadoop faster?

650

What is the sequencefileinputformat in hadoop?

713

What is the difference between traditional RDBMS and Hadoop?

1171

What is inputsplit in hadoop? Explain.

790

What is cloudera and why it is used?

797

What is salary of hadoop developer?

690

Can the balancer be run while Hadoop is in use?

975

Explain how input and output data format of the hadoop framework?

714

What is Partioner in hadoop? Where does it run

975

Can hbase run without hadoop?

743

Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

726

Can we do online transactions(oltp) using hadoop?

669

How would you tackle counting words in several text documents?

1022

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