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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 2132

What are the functions of NameNode?

 1 1413

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?

 647

What is the purpose of dfsadmin tool?

 917

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?

 695

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Un-Answered Questions { Apache Hadoop }

What is DistributedCache and its purpose?

632

Explain a simple Map/Reduce problem.

453

Explain the core components of hadoop?

398

What are the port numbers of namenode, job tracker and task tracker?

453

How Mapper is instantiated in a running job?

749




What are sink processors?

645

Define fault tolerance?

403

What are the network requirements for using hadoop?

384

Is client the end user in HDFS?

726

How does a namenode handle the failure of the data nodes?

428

What is the default block size in hdfs?

736

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

675

Explain Erasure Coding in Apache Hadoop?

420

On what basis Namenode will decide which datanode to write on?

1022

Name the various types of lists supported by bootstrap.

408

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