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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Explain the basic architecture of Hadoop?

933

On what basis name node distribute blocks across the data nodes?

1060

Name some companies that use Hadoop?

Airtel,

957

Rack awareness of Namenode?

854

Have you ever used Counters in Hadoop. Give us an example scenario?

1063

How is the distance between two nodes defined in Hadoop?

1455

What is speculative execution in Hadoop?

1051

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

1345

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

955

What are the problems with Hadoop 1.0?

1050

what are the nodes in the Hadoop cluster?

1045

What Mapper does?

987

What is your favourite tool in the hadoop ecosystem?

958

What is the function of NodeManager?

907

explain Metadata in Namenode?

918

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Un-Answered Questions { Apache Hadoop }

What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

1112

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

709

What do you mean by taskinstance?

750

What are the default configuration files that are used in hadoop?

691

How will format the HDFS ?

1066

Is hadoop a database?

686

How can we check whether namenode is working or not?

659

Define a job tracker?

704

Define a daemon?

669

Define streaming access?

673

how would you modify that solution to only count the number of unique words in all the documents?

973

How to enable trash/recycle bin in hadoop?

739

What do the master class and the output class do?

667

How to enable/configure the compression of map output data in hadoop?

766

Where is the Mapper Output stored?

1374

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