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?

1019

what factors the block size takes before creation?

1086

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

1260

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

983

Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications?

1111

What is difference between regular file system and HDFS?

1088

What is rack-aware replica placement policy?

1060

What is Hadoop?

1 1680

Are Namenode and job tracker on the same host?

1487

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

1137

What is HDFS Federation?

1024

What are watches?

1062

Explain the Job OutputFormat?

993

Virtual Box & Ubuntu Installation?

1035

What is the difference between HDFS and NAS ?

1412

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Un-Answered Questions { Apache Hadoop }

How can you overwrite the replication factors in HDFS?

1275

Can we do online transactions(oltp) using hadoop?

706

Explain why the name ‘hadoop’?

746

Define a task tracker?

687

What is the main purpose of HDFS fsck command?

1840

How to change Replication Factor For below cases ?

1143

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

1388

What is the default replication factor?

1020

What does ‘jps’ command do?

721

What is the relation between job and task in hadoop?

703

What is the functionality of jobtracker in hadoop?

763

What is the difference between Apache Hadoop and RDBMS?

841

Is hadoop obsolete?

686

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

1048

What is IdentityMapper?

1043

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