Apache Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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 2841

What are the functions of NameNode?

1 2053

How to configure hadoop to reuse JVM for mappers?

1229

How to resolve IOException: Cannot create directory

1067

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

1032

Which one is default InputFormat in Hadoop ?

1 2403

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

1100

what is a datanode?

969

How does NameNode tackle DataNode failures?

1202

What is InputSplit and RecordReader?

1001

What is the purpose of dfsadmin tool?

1287

How can you connect an application

1059

how is a file of the size 1 GB uncompressed

960

Is map like a pointer?

946

What is the default replication factor?

1020

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Un-Answered Questions { Apache Hadoop }

What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

1068

What is Row Key?

1027

How we can change Replication factor when Data is on the fly?

1382

Does Hadoop requires RAID?

985

How to resolve small file problem in hdfs?

1019

Explain the features of fully distributed mode?

668

How many instances of tasktracker run on a hadoop cluster?

720

What is a Task instance in Hadoop? Where does it run?1

879

What happens to job tracker when namenode is down?

715

How you can contact your client everyday ?

1004

What is the difference between rdbms and hadoop?

673

Can hive run without hadoop?

705

What will you do when NameNode is down?

1054

What is the process to change the files at arbitrary locations in HDFS?

1445

What is the communication channel between client and namenode/datanode?

1764

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