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Hadoop Interview Questions and Answers

  Difficulty Level: AllBeginnerIntermediateExperienced/Expert

Ques 1. What is Hadoop?

Ques 2. What platform and Java version are required to run Hadoop?

Ques 3. What kind of Hardware is best for Hadoop?

Ques 4. What are the most common input formats defined in Hadoop?

Ques 5. How do you categorize a big data?

Ques 6. Give the use of the bootstrap panel.

Ques 7. What is the purpose of button groups?

Ques 8. Name the various types of lists supported by Bootstrap.

Ques 9. Which command is used for the retrieval of the status of daemons running the Hadoop cluster?

Ques 10. What is InputSplit in Hadoop? Explain.

Ques 11. What is TextInputFormat in Hadoop?

Ques 12. What is the SequenceFileInputFormat in Hadoop?

Ques 13. How many InputSplits is made by a Hadoop Framework?

Ques 14. What is the use of RecordReader in Hadoop?

Ques 15. What is JobTracker in Hadoop?

Ques 16. What is WebDAV in Hadoop?

Ques 17. What is Sqoop in Hadoop?

Ques 18. What are the functionalities of JobTracker?

Ques 19. Define TaskTracker. What is TaskTracker in Hadoop?

Ques 20. What is Map/Reduce job in Hadoop?

Ques 21. What is "map" and what is "reducer" in Hadoop?

Ques 22. What is shuffling in MapReduce?

Ques 23. What is NameNode in Hadoop?

Ques 24. What is heartbeat in HDFS?

Ques 25. How is indexing done in HDFS?

Ques 26. What happens when a data node fails?

Ques 27. What is Hadoop Streaming?

Ques 28. What is a combiner in Hadoop?

Ques 29. What are the Hadoop's three configuration files?

Ques 30. What are the network requirements for using Hadoop?

Ques 31. What do you know by storage and compute node?

Ques 32. Is it necessary to know Java to learn Hadoop?

Ques 33. How to debug Hadoop code?

Ques 34. Is it possible to provide multiple inputs to Hadoop? If yes, explain.

Ques 35. What is the relation between job and task in Hadoop?

Ques 36. What is the difference between Input Split and HDFS Block?

Ques 37. What is the difference between HDFS and NAS?

Ques 38. What is the difference between Hadoop and other data processing tools?

Ques 39. What is distributed cache in Hadoop?

Ques 40. What is the functionality of JobTracker in Hadoop? How many instances of a JobTracker run on Hadoop cluster?

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