I am using cassandra db with billions of records, and I want to store data grouped by date. The problem is that I should query records with different timezones for users, but it stores data by GMT in partition keys. Is it correct to save different date fields for all timezones and create plenty of views? This would expand db to enormous size.
Cassandra partition problems
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I would suggest to make modification of your application layer to perform normalization of the user's date into GMT & perform search, and then convert dates back into user's timezone after retrieval.
But be careful with using dates as partition key - this could create so-called "hot" partitions when all write traffic will hit the same partitions & won't be evenly distributed between nodes.