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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 1173

What are the functions of NameNode?

1 674

How to configure hadoop to reuse JVM for mappers?

478

How to resolve IOException: Cannot create directory

365

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

402

Which one is default InputFormat in Hadoop ?

1 808

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

502

what is a datanode?

339

How does NameNode tackle DataNode failures?

477

What is InputSplit and RecordReader?

335

What is the purpose of dfsadmin tool?

630

How can you connect an application

423

how is a file of the size 1 GB uncompressed

315

Is map like a pointer?

375

What is the default replication factor?

373


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Un-Answered Questions { Apache Hadoop }

How does master slave architecture in the hadoop?

117


Explain Erasure Coding in Apache Hadoop?

119


What are channel selectors?

370


What if rack 2 and datanode fails?

479


Why password is needed in ssh localhost?

114






What is structured data?

99


Explain what happens in textinformat ?

139


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

320


What is inputsplit in hadoop? Explain.

98


What is the default block size in hdfs?

406


What is output format in hadoop?

105


what is the typical block size of an HDFS block?

364


What is the full form of fsck?

121


What is the use of combiners in the hadoop framework?

104


What is Rack Awareness in Apache Hadoop?

143