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Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Explain the difference between NameNode

356

What other technologies have you used in hadoop sta ck?

396

what is difference between int and intwritable?

780

What is Apache Hadoop YARN?

886

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

519

What are channel selectors?

377

What are the stable versions of Hadoop?

407

Input Split & Record Reader and what they do?

344

what is the default replication factor in HDFS?

383

How indexing is done in HDFS?

406

Why are the number of splits equal to the number of maps?

359

What are the two main components of ResourceManager?

439

How will you make changes to the default configuration files?

290

What are the different types of Znodes?

412

How many instances of JobTracker can run on a Hadoop Cluser?

363


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Un-Answered Questions { Apache Hadoop }

How a task is scheduled by a jobtracker?

107


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

830


What is the InputFormat ?

392


what is the default replication factor in HDFS?

383


Is hadoop the future?

95






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

130


What is a secondary namenode?

92


Is it necessary to know java to learn hadoop?

108


What are the different types of Znodes?

412


Explain the use of tasktracker in the hadoop cluster?

108


What is a heartbeat in HDFS?

344


What are the problems with Hadoop 1.0?

460


What is the use of Combiner?

384


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

129


What is a Record Reader in hadoop?

382