When to Redis? When to Tarantool?

Question

I do not want to get a detailed comparison. Neither do I want to define 'what is the best or fastest' in-memory DB.

They are both similar, so I want to get an overview of critical differences.

So what are they?

Answer 1

Let me be the one to offer a solution to the question above, I did a little research. From my point of view, these are the most critical things to know about them.

Overall

• both are extremely fast in-memory technologies
• open-source and Enterprise versions
• store all the data in-memory
• offer RPS of 10 000 and greater
• Persistence: they both snapshot data to disk
• Support async replication
• Redis is a key-value storage
• Tarantool supports key-value, but also supports documents and relational model

Why Redis is preferable

• easier to get started
• more Information on the Internet (look ant the number of question here, for example)
• a simplier technology overall
• more people are familiar with it

Why Tarantool is preferable

• supports secondary indexes
• supports iteration over indexes
• has a UI for cluster administration
• has an app-server onboard by default

Conclusion

• Redis is a great caching solution. Not recommended to use it as a main storage
• Tarantool is a multi parading DB. Can be used as a main storage
• Redis has a lower entry barrier
• Tarantool has a higher ceiling as a solution (relational model, distributed NoSQL storage, queues)