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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

What do you mean by taskinstance?

780

How hdfa differs with nfs?

776

How a task is scheduled by a jobtracker?

710

How many maximum jvm can run on a slave node?

721

What are the two main parts of the hadoop framework?

698

What is the use of combiners in the hadoop framework?

645

What is the jobtracker?

668

What is the jobtracker and what it performs in a hadoop cluster?

663

How many instances of tasktracker run on a hadoop cluster?

720

Explain the use of tasktracker in the hadoop cluster?

672

How does a namenode handle the failure of the data nodes?

732

What do you know about sequencefileinputformat?

665

Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

661

Why the name ‘hadoop’?

655

What do you know about nlineoutputformat?

730

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Un-Answered Questions { Apache Hadoop }

What is Apache Hadoop YARN?

1492

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

1086

What are the important differences between apache and hadoop?

732

What is difference between regular file system and HDFS?

1088

What is NoSQL?

959

Explain the features of pseudo mode?

750

What do you understand from Node redundancy and is it exist in hadoop cluster?

1270

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

754

What is Hadoop streaming?

1079

On which port does ssh work?

786

What is HDFS - Hadoop Distributed File System?

1002

What are different types of filesystem?

1173

What is high availability in hadoop?

707

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

1098

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

820

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