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

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2685

What are the functions of NameNode?

1 1909

How to configure hadoop to reuse JVM for mappers?

1163

How to resolve IOException: Cannot create directory

970

How to change replication factor of files already stored in HDFS?

959

Which one is default InputFormat in Hadoop ?

1 2272

shouldn't DFS be able to handle large volumes of data already?

1025

what is a datanode?

885

How does NameNode tackle DataNode failures?

1110

What is InputSplit and RecordReader?

879

What is the purpose of dfsadmin tool?

1200

How can you connect an application

984

how is a file of the size 1 GB uncompressed

878

Is map like a pointer?

879

What is the default replication factor?

948

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Un-Answered Questions { Apache Hadoop }

What are channel selectors?

960

Which command is used for the retrieval of the status of daemons running the hadoop cluster?

673

What is a checkpoint?

923

How to enable recycle bin in hadoop?

716

Can Apache Kafka be used without Zookeeper?

979

What is your favourite tool in the hadoop ecosystem?

925

What are the hadoop's three configuration files?

639

How does an hadoop application look like or their basic components?

659

Explain the overview of hadoop history breifly?

572

What alternate way does HDFS provides to recover data in case a Namenode

911

On what basis Namenode will decide which datanode to write on?

1215

What is rack-aware replica placement policy?

977

How the HDFS Blocks are replicated?

910

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

1193

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

598

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