Multiple key pointing to single value in Redis (Cache) with java
I want to store multiple keys with single value using jedis (Redis cache) with java.
I have three keys like user_1, driver_10, admin_5 and value = this is user, and I want to get value by using any one key among those three.
Answer
Having multiple keys point to same value is not supported in Redis for now, see issue #2668.
You would need a workaround.
Some ideas below, possibly obvious or stupid :)
Maybe have an intermediate key:
- user_10 → id_123
- driver_5 → id_123
- id_123 → data_that_you_dont_want_to_duplicate
You could implement that logic in your client code, or in custom Lua scripts on server, and have your client code use those scripts (but I don't know enough about that to provide details).
If you implement the indirection logic on client side, and if accesses are unbalanced, for example you would access data via user key 99% of the time, and via driver key 1% of the time, it might be worth avoiding 2 client-server round trips for the 99% case. For this you can encode redirections. For example, if first character is # then the rest is the data. If first character is @ then the rest is the actual key.
user_10→#data_that_you_dont_want_to_duplicatedriver_5→@user_10