Issue with Hash Map Space and Performance

Question

I have to store more than 100 millions of key-values in my HashMultiMap (key can have multiple values). Can anybody help me which one is faster for both storing and searching:

Answer 1

I'd recommend Redis. It's more of a data structure store than the others (e.g. it supports maps and sets) and requires very little effort to get started with. It's incredibly simple to use and has a great Java API.

I'd start by looking at the functions here that allow you to associate a key with a group of values.