1. What is Hadoop? What are the major constituents of Hadoop?
2. What is Hadoop Distributed File System Architecture?
3. What is MapReduce? What’s the application to Hadoop?
4. What are the major differences between Hadoop 1.x and Hadoop 2.x (YARN)?
5. How to install and configure Hadoop on a cluster?
6. What is Hadoop streaming?
7. How Hadoop ensure fault tolerance?
8. Describe NameNode and DataNode roles in HDFS
9. What are the schedulers in Hadoop YARN?
10. What are Hive, Pig, and HBase in Hadoop Ecosystem?
11. How do you manage unstructured data in Hadoop?
12. What is federation in the Hadoop ecosystem?
13. How does Hadoop optimize for data locality?
14. What is the difference between Apache Hadoop and Cloudera Distribution of Hadoop (CDH)?
15. How to secure a Hadoop cluster?
16. What is speculative execution in Hadoop?
17. Explain the concept of block size in Hadoop.
18. Advantages and Limitations of Hadoop.
19. How to monitor and troubleshoot a Hadoop cluster?
20. Common use cases of Hadoop in big data analytics
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