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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

How to resolve small file problem in hdfs?

403

what factors the block size takes before creation?

391

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

656

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

410

Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications?

437

What is difference between regular file system and HDFS?

433

What is rack-aware replica placement policy?

435

What is Hadoop?

1 663

Are Namenode and job tracker on the same host?

805

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

435

What is HDFS Federation?

403

What are watches?

425

Explain the Job OutputFormat?

456

Virtual Box & Ubuntu Installation?

369

What is the difference between HDFS and NAS ?

705


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Un-Answered Questions { Apache Hadoop }

how would you modify that solution to only count the number of unique words in all the documents?

461


How would you use Map/Reduce to split a very large graph into smaller pieces and parallelize the computation of edges according to the fast/dynamic change of data?

149


Why is hadoop faster?

117


What is a 'block' in HDFS?

425


Are Namenode and job tracker on the same host?

805






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

435


What is rack-aware replica placement policy?

435


How many instances of a jobtracker run on hadoop cluster?

129


Define tasktracker.

136


What hadoop does in safe mode?

128


What are the different types of Znodes?

436


What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

632


How is the option in Hadoop to skip the bad records?

419


What happens in a textinputformat?

123


Explain how do ‘map’ and ‘reduce’ works?

171