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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

 1 2128

What are the functions of NameNode?

 1 1411

How to configure hadoop to reuse JVM for mappers?

 793

How to resolve IOException: Cannot create directory

 679

How to change replication factor of files already stored in HDFS?

 713

Which one is default InputFormat in Hadoop ?

 1 1670

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

 776

what is a datanode?

 641

How does NameNode tackle DataNode failures?

 879

What is InputSplit and RecordReader?

 646

What is the purpose of dfsadmin tool?

 915

How can you connect an application

 724

how is a file of the size 1 GB uncompressed

 591

Is map like a pointer?

 679

What is the default replication factor?

 693

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Un-Answered Questions { Apache Hadoop }

What if rack 2 and datanode fails?

799

How hdfa differs with nfs?

393

How many Daemon processes run on a Hadoop system?

837

What are the main components of a Hadoop Application?

745

What is zookeeper in hadoop?

380




What exactly is hadoop?

426

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?

424

What happens to a namenode, when job tracker is down?

431

What is the purpose of button groups?

397

How to configure hadoop to reuse JVM for mappers?

793

Is hadoop the future?

373

Where is the Mapper Output intermediate kay-value data stored ?

1061

Explain a simple Map/Reduce problem.

452

Why do we use Hadoop?

640

Where is the Mapper Output stored?

1068

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