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 difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

722

How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

728

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

728

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

668

What are the important differences between apache and hadoop?

704

What is the difference between rdbms and hadoop?

645

Define tasktracker.

654

Is it necessary to write jobs for hadoop in the java language?

661

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

718

What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?

783

Is it necessary to know java to learn hadoop?

663

Explain the use of .mecia class?

784

What is the sequencefileinputformat in hadoop?

713

What is the difference between hadoop and other data processing tools?

688

Which data storage components are used by hadoop?

666

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Un-Answered Questions { Apache Hadoop }

Explain what if rack 2 and datanode fails?

636

What happens to a NameNode that has no data?

1585

Is hadoop required for data science?

684

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

1232

Where is the Mapper Output stored?

1374

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

1328

How is the distance between two nodes defined in Hadoop?

1455

What is yarn in hadoop?

676

How to change Replication Factor For below cases ?

1086

How to come out of the insert mode?

787

What do slaves consist of?

667

Explain the features of pseudo mode?

702

What is the problem with HDFS and streaming data like logs

1022

How is the option in Hadoop to skip the bad records?

949

Mention what is the number of default partitioner in Hadoop?

694

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