Should I learn Hadoop or spark?

Related questions

1. Is Hadoop a good career?
2. What is meant by Hadoop?
3. Is Hadoop easy?
4. How Hadoop is better than Rdbms?
5. What is Hadoop in simple terms?
6. Can I learn Hadoop without knowing Java?
7. Is Hadoop needed for spark?
8. Is Hadoop the future?
9. Should I learn Hadoop or python?
10. When use Hadoop vs SQL?

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5. #mapreduce
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12. #other
13. #independent
14. #framework
15. #which
16. #hadoop
17. #classes
18. #became