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 Mapper is instantiated in a running job?

1031

Where do you specify the Mapper Implementation?

1052

What is the meaning of speculative execution in Hadoop? Why is it important?

1088

What is the InputFormat ?

1059

Command to format the NameNode?

981

Who is a 'user' in HDFS?

938

What is the meaning of the term "non-DFS used" in Hadoop web-console?

1350

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

1051

What is DistributedCache and its purpose?

942

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

948

What is HDFS Block size? How is it different from traditional file system block size?

1 1504

How you can contact your client everyday ?

1007

What is Input Split in hadoop?

1040

What is 'Key value pair' in HDFS?

1003

How to keep HDFS cluster balanced?

1133

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Un-Answered Questions { Apache Hadoop }

Which files are used by the startup and shutdown commands?

769

Explain how is hadoop different from other data processing tools?

766

What is output format in hadoop?

729

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

753

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

1102

Can you explain how do ‘map’ and ‘reduce’ work?

770

What problems can be addressed by using Zookeeper?

982

Is client the end user in HDFS?

1008

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

731

What are the site-specific configuration files in Hadoop?

1133

How is HDFS fault tolerant?

1075

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

1299

How blocks are distributed among all data nodes for a particular chunk of data?

1152

Is map like a pointer?

950

What is the default block size in hdfs?

1082

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