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 to resolve small file problem in hdfs?

980

what factors the block size takes before creation?

1034

Which are the two types of 'writes' in HDFS?

1219

Explain use cases where SequenceFile class can be a good fit?

941

Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications?

1069

What is difference between regular file system and HDFS?

1056

What is rack-aware replica placement policy?

1026

What is Hadoop?

1 1630

Are Namenode and job tracker on the same host?

1457

What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

1106

What is HDFS Federation?

983

What are watches?

1033

Explain the Job OutputFormat?

960

Virtual Box & Ubuntu Installation?

989

What is the difference between HDFS and NAS ?

1372

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Un-Answered Questions { Apache Hadoop }

What exactly is hadoop?

691

What is Disk Balancer in Apache Hadoop?

889

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

668

What are the site-specific configuration files in Hadoop?

1091

Explain the master class and the output class do?

652

What is the sequencefileinputformat in hadoop?

713

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

1057

What is oozie in hadoop?

672

What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

722

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

1067

On what basis data will be stored on a rack?

1140

What is commodity hardware?

659

Can Hadoop be compared to NOSQL database like Cassandra?

910

What is a secondary namenode?

628

What is high availability in hadoop?

674

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