Who uses Cassandra DB?

Related questions

1. Can a composite primary key have null value?
2. Can clustering key be null in Cassandra?
3. Is a collection of related nodes?
4. Does AWS support Cassandra?
5. What is Vnode in Cassandra?
6. Why is Cassandra NoSQL?
7. Is Cassandra good for analytics?
8. What is partition key in Cassandra?
9. How big can a MongoDB be?
10. Is primary key unique in Cassandra?

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