{"id":10310,"date":"2023-05-02T12:12:28","date_gmt":"2023-05-02T12:12:28","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10310"},"modified":"2023-06-19T13:29:41","modified_gmt":"2023-06-19T13:29:41","slug":"top-50-hadoop-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-hadoop-interview-questions-with-answers\/","title":{"rendered":"Top 50 Hadoop Interview Questions with Answers"},"content":{"rendered":"
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Hadoop Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n

1. What is Hadoop?<\/h3>\n\n\n\n

a) A programming language
b) A software framework
c) A database management system
d) A data visualization tool<\/p>\n\n\n\n

Answer: b) A software framework<\/h4>\n\n\n\n

2. Which of the following is not a component of Hadoop?<\/h3>\n\n\n\n

a) HDFS
b) MapReduce
c) Spark
d) YARN<\/p>\n\n\n\n

Answer: c) Spark<\/h4>\n\n\n\n

3. What is HDFS?<\/h3>\n\n\n\n

a) Hadoop Distributed File System
b) Hadoop Data Formatting System
c) Hadoop Data Flow System
d) Hadoop Data Filtering System<\/p>\n\n\n\n

Answer: a) Hadoop Distributed File System<\/h4>\n\n\n\n

4. What is MapReduce?<\/h3>\n\n\n\n

a) A component of Hadoop used for data processing
b) A programming language used for web development
c) A database management system
d) A data visualization tool<\/p>\n\n\n\n

Answer: a) A component of Hadoop used for data processing<\/h4>\n\n\n\n

5. What is the default block size of HDFS?<\/h3>\n\n\n\n

a) 64 MB
b) 128 MB
c) 256 MB
d) 512 MB<\/p>\n\n\n\n

Answer: b) 128 MB<\/h4>\n\n\n\n

6. Which programming language is used in Hadoop MapReduce?<\/h3>\n\n\n\n

a) Java
b) Python
c) C++
d) Ruby<\/p>\n\n\n\n

Answer: a) Java<\/h4>\n\n\n\n

7. What is a NameNode in Hadoop?<\/h3>\n\n\n\n

a) The node that stores the data
b) The node that manages the cluster and stores metadata about HDFS
c) The node that runs the MapReduce jobs
d) The node that handles network traffic<\/p>\n\n\n\n

Answer: b) The node that manages the cluster and stores metadata about HDFS<\/h4>\n\n\n\n

8. Which of the following is responsible for resource management in Hadoop?<\/h3>\n\n\n\n

a) HDFS
b) MapReduce
c) YARN
d) NodeManager<\/p>\n\n\n\n

Answer: c) YARN<\/h4>\n\n\n\n

9. Which of the following is not a role in Hadoop?<\/h3>\n\n\n\n

a) NameNode
b) DataNode
c) JobTracker
d) TaskManager<\/p>\n\n\n\n

Answer: d) TaskManager<\/h4>\n\n\n\n

10. Which component in Hadoop is responsible for data processing?<\/h3>\n\n\n\n

a) NameNode
b) DataNode
c) JobTracker
d) TaskTracker<\/p>\n\n\n\n

Answer: d) TaskTracker<\/h4>\n\n\n\n

11. What is a block in Hadoop?<\/h3>\n\n\n\n

a) A group of files
b) A unit of data stored in HDFS
c) A node in the cluster
d) A data processing job<\/p>\n\n\n\n

Answer: b) A unit of data stored in HDFS<\/h4>\n\n\n\n

12. Which of the following is not a benefit of Hadoop?<\/h3>\n\n\n\n

a) Scalability
b) Data security
c) Fault tolerance
d) High availability<\/p>\n\n\n\n

Answer: b) Data security<\/h4>\n\n\n\n

13. What is the maximum number of NameNodes in a Hadoop cluster?<\/h3>\n\n\n\n

a) 1
b) 2
c) 3
d) Unlimited<\/p>\n\n\n\n

Answer: a) 1<\/h4>\n\n\n\n

14. What is a secondary NameNode in Hadoop?<\/h3>\n\n\n\n

a) A backup NameNode used in case the primary NameNode fails
b) A node that handles network traffic
c) A node that stores metadata about the cluster
d) A node that manages MapReduce jobs<\/p>\n\n\n\n

Answer: a) A backup NameNode used in case the primary NameNode fails<\/h4>\n\n\n\n

15. Which of the following is used to write MapReduce jobs in Python?<\/h3>\n\n\n\n

a) PyMapReduce
b) Hadoop Streaming
c) Hadoop Pipes
d) Hadoop Java API<\/p>\n\n\n\n

Answer: b) Hadoop Streaming<\/h4>\n\n\n\n

16. What is the default port for the Hadoop NameNode web UI?<\/h3>\n\n\n\n

a) 50070
b) 60010
c) 8080
d) 9000<\/p>\n\n\n\n

Answer: a) 50070<\/h4>\n\n\n\n

17. Which of the following is not a characteristic of Big Data?<\/h3>\n\n\n\n

a) Volume
b) Variety
c) Velocity
d) Value<\/p>\n\n\n\n

Answer: d) Value<\/h4>\n\n\n\n

18. Which of the following is not a Hadoop ecosystem project?<\/h3>\n\n\n\n

a) Hive
b) HBase
c) Pig
d) Spark<\/p>\n\n\n\n

Answer: d) Spark<\/h4>\n\n\n\n

19. What is ZooKeeper in Hadoop?<\/h3>\n\n\n\n

a) A component that manages the metadata of HDFS
b) A tool used for building distributed systems
c) A query engine used for data analysis
d) A data storage platform<\/p>\n\n\n\n

Answer: b) A tool used for building distributed systems<\/h4>\n\n\n\n

20. Which of the following is a data warehouse system for Hadoop?<\/h3>\n\n\n\n

a) Hive
b) Pig
c) HBase
d) ZooKeeper<\/p>\n\n\n\n

Answer: a) Hive<\/h4>\n\n\n\n

21. What is a data node in Hadoop?<\/h3>\n\n\n\n

a) A node that manages metadata about HDFS
b) A node that manages MapReduce jobs
c) A node that stores data in HDFS
d) A node that handles network traffic<\/p>\n\n\n\n

Answer: c) A node that stores data in HDFS<\/h4>\n\n\n\n

22. Which of the following is not a database management system?<\/h3>\n\n\n\n

a) MySQL
b) Oracle
c) MongoDB
d) Spark<\/p>\n\n\n\n

Answer: d) Spark<\/h4>\n\n\n\n

23. What is a block replica in Hadoop?<\/h3>\n\n\n\n

a) A backup copy of a block of data stored in HDFS
b) A processing unit in MapReduce
c) A tool used for data visualization
d) A database management system for Hadoop<\/p>\n\n\n\n

Answer: a) A backup copy of a block of data stored in HDFS<\/h4>\n\n\n\n

24. What is a decommission in Hadoop?<\/h3>\n\n\n\n

a) The process of adding a new node to the cluster
b) The process of removing a node from the cluster
c) The process of scaling up the cluster
d) The process of scaling down the cluster<\/p>\n\n\n\n

Answer: b) The process of removing a node from the cluster<\/h4>\n\n\n\n

25. Which of the following is not a characteristic of a distributed system?<\/h3>\n\n\n\n

a) Scalability
b) Fault tolerance
c) Compatibility
d) Reliability<\/p>\n\n\n\n

Answer: c) Compatibility<\/h4>\n\n\n\n

26. What is the default replication factor in Hadoop?<\/h3>\n\n\n\n

a) 1
b) 2
c) 3
d) 4<\/p>\n\n\n\n

Answer: c) 3<\/h4>\n\n\n\n

27. What is a task in MapReduce?<\/h3>\n\n\n\n

a) A processing unit that performs a specific operation on the data
b) A processing unit that stores the data
c) A processing unit that manages the metadata of the cluster
d) A processing unit that handles network traffic<\/p>\n\n\n\n

Answer: a) A processing unit that performs a specific operation on the data<\/h4>\n\n\n\n

28. Which of the following is used for data analysis in Hadoop?<\/h3>\n\n\n\n

a) Pig
b) HBase
c) ZooKeeper
d) YARN<\/p>\n\n\n\n

Answer: a) Pig<\/h4>\n\n\n\n

29. What is HBase in Hadoop?<\/h3>\n\n\n\n

a) A platform for real-time data processing
b) A query engine for data analysis
c) A data storage system
d) A tool used for building distributed systems<\/p>\n\n\n\n

Answer: c) A data storage system<\/h4>\n\n\n\n

30. What is a reducer in MapReduce?<\/h3>\n\n\n\n

a) A processing unit that performs a specific operation on the data
b) A processing unit that stores the data
c) A processing unit that manages the metadata of the cluster
d) A processing unit that combines the output from the mappers<\/p>\n\n\n\n

Answer: d) A processing unit that combines the output from the mappers<\/h4>\n\n\n\n

31. Which of the following statements is true about Hadoop Distributed Cache?<\/h3>\n\n\n\n

a) It is used to store metadata about HDFS
b) It is used to store intermediate data during MapReduce jobs
c) It is used to cache files needed by the MapReduce jobs
d) It is used to compress data stored in HDFS<\/p>\n\n\n\n

Answer: c) It is used to cache files needed by the MapReduce jobs<\/h4>\n\n\n\n

32. What is a combiner in MapReduce?<\/h3>\n\n\n\n

a) A processing unit that performs a specific operation on the data
b) A processing unit that stores the data
c) A processing unit that manages the metadata of the cluster
d) A processing unit that performs a local reduction on the output from the mappers<\/p>\n\n\n\n

Answer: d) A processing unit that performs a local reduction on the output from the mappers<\/h4>\n\n\n\n

33. Which of the following is a way to optimize MapReduce jobs?<\/h3>\n\n\n\n

a) Combiners
b) Distributed Cache
c) Replication
d) Decommissioning<\/p>\n\n\n\n

Answer: a) Combiners<\/h4>\n\n\n\n

34. What is a data block scanner in Hadoop?<\/h3>\n\n\n\n

a) A tool used to scan the metadata of HDFS
b) A tool used to scan the data stored in HDFS for errors
c) A tool used to scan the output from MapReduce jobs
d) A tool used to scan the input to MapReduce jobs<\/p>\n\n\n\n

Answer: b) A tool used to scan the data stored in HDFS for errors<\/h4>\n\n\n\n

35. Which of the following is not a characteristic of Hadoop Distributed File System (HDFS)?<\/h3>\n\n\n\n

a) Scalability
b) Fault tolerance
c) Consistency
d) High availability<\/p>\n\n\n\n

Answer: c) Consistency<\/h4>\n\n\n\n

36. What is an EC2 instance in Hadoop?<\/h3>\n\n\n\n

a) A type of virtual machine used in Hadoop
b) A database management system for Hadoop
c) A tool used for building distributed systems
d) A programming language used in Hadoop<\/p>\n\n\n\n

Answer: a) A type of virtual machine used in Hadoop<\/h4>\n\n\n\n

37. How does Hadoop ensure fault tolerance?<\/h3>\n\n\n\n

a) By replicating data across multiple nodes in the cluster
b) By compressing data stored in HDFS
c) By optimizing MapReduce algorithms
d) By using a distributed file system<\/p>\n\n\n\n

Answer: a) By replicating data across multiple nodes in the cluster<\/h4>\n\n\n\n

38. Which of the following is a way to improve the scalability of a Hadoop cluster?<\/h3>\n\n\n\n

a) Increasing the size of the NameNode
b) Increasing the block size of HDFS
c) Decreasing the replication factor
d) Decreasing the number of nodes in the cluster<\/p>\n\n\n\n

Answer: b) Increasing the block size of HDFS<\/h4>\n\n\n\n

39. What is a slot in Hadoop?<\/h3>\n\n\n\n

a) A processing unit in MapReduce
b) A node in the cluster
c) A unit of data stored in HDFS
d) A tool used for data visualization<\/p>\n\n\n\n

Answer: a) A processing unit in MapReduce<\/h4>\n\n\n\n

40. Which of the following is not a reason to use Hadoop?<\/h3>\n\n\n\n

a) Real-time data processing
b) Data storage and retrieval
c) High velocity data processing
d) Querying large datasets<\/p>\n\n\n\n

Answer: a) Real-time data processing<\/h4>\n\n\n\n

41. Which of the following is not a characteristic of Hadoop MapReduce?<\/h3>\n\n\n\n

a) Scalability
b) Fault tolerance
c) Compatibility
d) High availability<\/p>\n\n\n\n

Answer: c) Compatibility<\/h4>\n\n\n\n

42. What is a queue in YARN?<\/h3>\n\n\n\n

a) An ordered list of MapReduce jobs
b) A mechanism for resource allocation in YARN
c) A data storage system
d) A tool used for building distributed systems<\/p>\n\n\n\n

Answer: b) A mechanism for resource allocation in YARN<\/h4>\n\n\n\n

43. What is a checkpoint in Hadoop?<\/h3>\n\n\n\n

a) A backup copy of the metadata in HDFS
b) A processing unit in MapReduce
c) A network traffic analyzer
d) A tool used for data visualization<\/p>\n\n\n\n

Answer: a) A backup copy of the metadata in HDFS<\/h4>\n\n\n\n

44. What is a JobTracker in Hadoop?<\/h3>\n\n\n\n

a) The node that manages the metadata of HDFS
b) The node that manages MapReduce jobs
c) The node that stores data in HDFS
d) The node that handles network traffic<\/p>\n\n\n\n

Answer: b) The node that manages MapReduce jobs<\/h4>\n\n\n\n

45. Which of the following is not a database management system for Hadoop?<\/h3>\n\n\n\n

a) Hive
b) HBase
c) Cassandra
d) MapR<\/p>\n\n\n\n

Answer: d) MapR<\/h4>\n\n\n\n

46. What is a TaskTracker in Hadoop?<\/h3>\n\n\n\n

a) The node that manages the metadata of HDFS
b) The node that manages MapReduce jobs
c) The node that stores data in HDFS
d) The node that handles network traffic<\/p>\n\n\n\n

Answer: b) The node that manages MapReduce jobs<\/h4>\n\n\n\n

47. What is a NameNode in Hadoop?<\/h3>\n\n\n\n

a) The node that manages the metadata of HDFS
b) The node that manages MapReduce jobs
c) The node that stores data in HDFS
d) The node that handles network traffic<\/p>\n\n\n\n

Answer: a) The node that manages the metadata of HDFS<\/h4>\n\n\n\n

48. Which of the following is not a characteristic of Hadoop YARN?<\/h3>\n\n\n\n

a) Scalability
b) Fault tolerance
c) Compatibility
d) High availability<\/p>\n\n\n\n

Answer: c) Compatibility<\/h4>\n\n\n\n

49. What is a container in YARN?<\/h3>\n\n\n\n

a) A mechanism for resource allocation
b) A node in the Hadoop cluster
c) A processing unit in MapReduce
d) A data storage system<\/p>\n\n\n\n

Answer: a) A mechanism for resource allocation<\/h4>\n\n\n\n

50. Which of the following is not a way to optimize MapReduce jobs?<\/h3>\n\n\n\n

a) Replication
b) Combiners
c) Distributed Cache
d) Partitioning<\/p>\n\n\n\n

Answer: a) Replication<\/h4>\n","protected":false},"excerpt":{"rendered":"

1. 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