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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

How to change from su to cloudera?

719

Why password is needed in ssh localhost?

804

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

753

What does the command mapred.job.tracker do?

780

How to come out of the insert mode?

787

What is the full form of fsck?

702

Why do we need a password-less ssh in fully distributed environment?

709

Can you give us some more details about ssh communication between masters and the slaves?

703

Can you tell us more about ssh?

716

How does master slave architecture in the hadoop?

816

Explain the wordcount implementation via hadoop framework ?

724

What is hadoop framework?

723

What is partioner in hadoop? Where does it run,mapper or reducer?

673

What is a task instance in hadoop? Where does it run?

615

How to enable recycle bin in hadoop?

766

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Un-Answered Questions { Apache Hadoop }

Is it possible to provide multiple inputs to hadoop? If yes, explain.

659

Define fault tolerance?

655

What is the difference between SQL and NoSQL?

1078

What is small file problem in hadoop?

785

What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

722

what are the nodes in the Hadoop cluster?

1045

What is the difference between HDFS and NAS ?

1372

What happens to a NameNode that has no data?

1585

What is Hadoop serialization?

697

What is Distributed Cache?

908

How can you connect an application

1028

How to come out of the insert mode?

787

What problems have you faced when you are working on Hadoop code?

971

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

1354

Explain how input and output data format of the hadoop framework?

714

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