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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

What does ‘jps’ command do?

727

Mention what is the use of Context Object?

755

What is commodity hardware?

712

Explain what is sqoop in Hadoop ?

775

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

782

Explain what is the purpose of RecordReader in Hadoop?

788

How to restart Namenode?

802

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

802

Mention what are the data components used by Hadoop?

695

What does /etc /init.d do?

738

What is a Combiner?

798

Main Components of Hadoop?

820

What are the four characteristics of Big Data?

765

Mention what is the number of default partitioner in Hadoop?

751

Explain what happens in textinformat ?

787

Un-Answered Questions { Hadoop }

What are the four characteristics of Big Data?

765

Why is there a need for broadcast variables when working with Apache Spark?

323

What is difference between Column and Super Column?

What is Apache Cassandra?

Explain what is a difference between an input split and hdfs block?

Replication causes data redundancy then why is is pursued in HDFS?

What happens in text format?

490

What is HBase?

367

Explain what combiners are and when you should use a combiner in a mapreduce job?

668

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

988

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

585

How can you manually partition the rdd?

316

Why we use BloomMapFile?

647

What does map transformation do? Provide an example.

332

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

778

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