How difficult is Hadoop?

Related questions

1. Is Hadoop useful?
2. What is Cloudera Hadoop?
3. Is Hadoop a good career?
4. Is Hadoop a programming language?
5. Does Hadoop require coding?
6. Is Hadoop the future?
7. What is meant by Hadoop?
8. Can I learn Hadoop without knowing Java?
9. Is Hadoop worth learning?
10. What is Big Data Hadoop?

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