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Item Table: shard by ItemID
- ashok.b October 27, 2020Cart Table: shard by UserID
Item Availability: stored in redis (key = ItemID)
When a user clicks on Add to cart, it quickly checks in Redis the availability and moves forward in the checkout flow.
RDBMS can easily handle 3k writes/sec,on a single table, in a single shard.
So, for storing Item & Cart table, RDBMs is good enough for this usecase, but, if it can't scale for this load, we can go for Redis to store this data also.
Let me know if you see any issue with this approach or it looks good.