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 2341

What are the functions of NameNode?

1 1583

How to configure hadoop to reuse JVM for mappers?

906

How to resolve IOException: Cannot create directory

778

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

808

Which one is default InputFormat in Hadoop ?

1 1876

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

868

what is a datanode?

733

How does NameNode tackle DataNode failures?

966

What is InputSplit and RecordReader?

739

What is the purpose of dfsadmin tool?

1025

How can you connect an application

818

how is a file of the size 1 GB uncompressed

674

Is map like a pointer?

758

What is the default replication factor?

775

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Un-Answered Questions { Apache Hadoop }

On which port does ssh work?

534

How can I install Cloudera VM in my system?

747

How is the distance between two nodes defined in Hadoop?

1262

What is rack-aware replica placement policy?

776

What is Schema on Read and Schema on Write?

734

What is speculative execution in Hadoop?

875

What are the modules that constitute the Apache Hadoop 2.0 framework?

801

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

831

What are sink processors?

729

What does the command mapred.job.tracker do?

530

How blocks are distributed among all data nodes for a particular chunk of data?

840

How we can change Replication factor when Data is on the fly?

1164

Explain a simple Map/Reduce problem.

548

How does NameNode tackle DataNode failures?

966

What is hbase in hadoop?

485

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