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 is safe mode in Hadoop?

1002

What is MapFile?

997

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

1270

What happens to a NameNode that has no data?

1616

What is a heartbeat in HDFS?

972

What are sink processors?

945

Does hadoop always require digital data to process?

1212

what is meaning Replication factor?

989

What is the purpose of RawComparator interface?

1171

Where is the Mapper Output stored?

1405

What is the function of ApplicationMaster?

1011

What problems can be addressed by using Zookeeper?

978

What is Hadoop streaming?

1080

Is client the end user in HDFS?

1007

Can the balancer be run while Hadoop is in use?

1011

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Un-Answered Questions { Apache Hadoop }

Explain how do ‘map’ and ‘reduce’ works?

778

Can we do online transactions(oltp) using hadoop?

707

What is inputformat in hadoop?

791

What are the different methods to run Spark over Apache Hadoop?

760

Explain the core components of hadoop?

692

How will format the HDFS ?

1113

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

1100

What is Apache Hadoop YARN?

1493

Explain the hadoop configuration files at present?

696

Explain use cases where SequenceFile class can be a good fit?

986

Is hadoop based on google mapreduce?

729

Define a datanode?

687

Define a combiner?

694

How to enable recycle bin or trash in hadoop?

732

Explain what if rack 2 and datanode fails?

672

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