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 difference between NameNode

879

What other technologies have you used in hadoop sta ck?

927

what is difference between int and intwritable?

1408

What is Apache Hadoop YARN?

1416

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

1063

What are channel selectors?

950

What are the stable versions of Hadoop?

953

Input Split & Record Reader and what they do?

968

what is the default replication factor in HDFS?

974

How indexing is done in HDFS?

1017

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

907

What are the two main components of ResourceManager?

1089

How will you make changes to the default configuration files?

901

What are the different types of Znodes?

939

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

971

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Un-Answered Questions { Apache Hadoop }

Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

662

What is a spill factor with respect to the ram?

812

Is hadoop required for data science?

627

Define fault tolerance?

607

What are the problems with Hadoop 1.0?

990

What is the main purpose of HDFS fsck command?

1717

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

666

What are the steps to submit a Hadoop job?

865

How to write a Custom Key Class?

893

What is the purpose of DataNode block scanner?

884

Explain how can we change the split size if our commodity hardware has less storage space?

593

Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

714

How to resolve IOException: Cannot create directory

967

What do the master class and the output class do?

622

How would you tackle counting words in several text documents?

978

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