Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Explain the difference between NameNode

771

What other technologies have you used in hadoop sta ck?

838

what is difference between int and intwritable?

1232

What is Apache Hadoop YARN?

1309

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

895

What are channel selectors?

778

What are the stable versions of Hadoop?

829

Input Split & Record Reader and what they do?

810

what is the default replication factor in HDFS?

825

How indexing is done in HDFS?

855

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

794

What are the two main components of ResourceManager?

939

How will you make changes to the default configuration files?

716

What are the different types of Znodes?

824

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

806


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Un-Answered Questions { Apache Hadoop }

What are the two main parts of the hadoop framework?

490


What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

503


Explain the hadoop configuration files at present?

491


What do you mean by taskinstance?

528


when hadoop enter in safe mode?

569


How many instances of tasktracker run on a hadoop cluster?

535


Does this lead to security issues?

545


What does job conf class do?

500


On which port does ssh work?

568


How indexing is done in HDFS?

855


Define a job tracker?

525


How to configure hadoop to reuse JVM for mappers?

953


How do you categorize a big data?

526


What does ‘jps’ command do?

533


What is the best hardware configuration to run Hadoop?

1468