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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

How Mapper is instantiated in a running job?

497

Where do you specify the Mapper Implementation?

387

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

474

What is the InputFormat ?

420

Command to format the NameNode?

364

Who is a 'user' in HDFS?

400

What is the meaning of the term "non-DFS used" in Hadoop web-console?

650

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

459

What is DistributedCache and its purpose?

372

What is HDFS ? How it is different from traditional file systems?

350

What is HDFS Block size? How is it different from traditional file system block size?

1 482

How you can contact your client everyday ?

342

What is Input Split in hadoop?

373

What is 'Key value pair' in HDFS?

377

How to keep HDFS cluster balanced?

513


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Un-Answered Questions { Apache Hadoop }

Which are the three main hdfs-site.xml properties?

150


Why is Apache Spark faster than Apache Hadoop?

181


What alternate way does HDFS provides to recover data in case a Namenode

415


How to exit the vi editor?

135


What are the modes in which Apache Hadoop run?

178






What are the limitations of importing RDBMS tables into Hcatalog directly?

413


What are the site-specific configuration files in Hadoop?

396


Can we have multiple entries in the master files?

153


What do you know about sequencefileinputformat?

116


What does the command mapred.job.tracker do?

145


what should be the ideal replication factor in hadoop?

152


How is hadoop different from other data processing tools?

134


Mention what is the use of Context Object?

164


Explain why the name ‘hadoop’?

120


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

462