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Hadoop Interview Questions
Questions Answers Views Company eMail

What does ‘jps’ command do?

727

Mention what is the use of Context Object?

753

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?

787

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?

693

What does /etc /init.d do?

738

What is a Combiner?

798

Main Components of Hadoop?

818

What are the four characteristics of Big Data?

764

Mention what is the number of default partitioner in Hadoop?

748

Explain what happens in textinformat ?

787


Un-Answered Questions { Hadoop }

What do you use spark for?

375


What are the main hdfs-site.xml properties?

48


What is spark databricks?

337


Write a Hive UDF that returns a sentiment score. For example, if good = 1, bad = -1, and average = 0, then a review of a restaurant states "Good food, bad service," your score might be 1 - 1 = 0.

732


How often do you need to reformat the namenode?

556


What are the modes in which Hadoop run?

553


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

714


Are job tracker and task trackers present in separate machines?

505


What is catalyst query optimizer in apache spark?

306


How can you make sure of logical grouping of cells in the hbase?

207


What is the difference between HDFS block and input split?

946


Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

553


Explain what is the row key?

153


What is Spark Dataset?

339


What are combiners and its purpose?

978