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?

928

what factors the block size takes before creation?

964

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

1170

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

901

Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications?

1004

What is difference between regular file system and HDFS?

996

What is rack-aware replica placement policy?

973

What is Hadoop?

1 1554

Are Namenode and job tracker on the same host?

1407

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

1061

What is HDFS Federation?

932

What are watches?

983

Explain the Job OutputFormat?

913

Virtual Box & Ubuntu Installation?

931

What is the difference between HDFS and NAS ?

1319

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Un-Answered Questions { Apache Hadoop }

Explain what if rack 2 and datanode fails?

590

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

593

Explain why do we need hadoop?

621

What is Schema on Read and Schema on Write?

864

How can I install Cloudera VM in my system?

912

What is version-id mismatch error in hadoop?

1018

What is Apache Hadoop YARN?

1417

Can you give us some more details about ssh communication between masters and the slaves?

652

What do you know about keyvaluetextinputformat?

559

How to resolve IOException: Cannot create directory

969

What hadoop does in safe mode?

613

Mention what is the number of default partitioner in Hadoop?

640

What are the hadoop's three configuration files?

639

What does the command mapred.job.tracker do?

721

What does ‘jps’ command do?

650

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