Designing Unique Keys(Primary Keys) for a heavily denormalized NoSQL database?

Then you could use a simple synchronized counter and initialize it on startup with the next available id On the other hand a database should be able to handle the UUID hashes as created by java. This is a standard for creating things like sessionIds, that need to be unique. Your problem is somewhat similar since a session in your context would represent a set of user input.

Then you could use a simple synchronized counter and initialize it on startup with the next available id. On the other hand a database should be able to handle the UUID hashes as created by java. This is a standard for creating things like sessionIds, that need to be unique.

Your problem is somewhat similar since a session in your context would represent a set of user input.

Thanks Oliver! Yes this is a distributed application with a distributed database Cassandra. Since this database is eventually consistent, the synchronization may not be very fast and this may lead to problems as the data for that id may be overridden.

But it is also possible to tune the consistency level in Cassandra, I'll look into that if that leads to a feasible solution. Is there any other alternative besides this? – Marcos Feb 3 at 8:24 For the Ids of the posts should I generate them using combination of 'userId' & 'Posts count of that user' like this userId:PostCountOfUser – Marcos Feb 3 at 8:24 using the userId as part of your sounds like a good idea in your scenario.

Depending on your data representation it could also enable you to search faster for all posts of a user. (I guess you can assume a user is only logged on once, and entering posts in one session at a time) – Oliver Feb 3 at 14:58.

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