Our great sponsors
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Redis
Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLogs, Bitmaps.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
If you have not heard about Dragonfly - please check it out. It uses - what I hope - novel and interesting ideas backed up by the research from recent years [1] and [2]. It's meant to fix many problems that exist with Redis today. I have been working on Dragonfly for the last 7 months and it has been one of the more interesting and challenging projects I've ever done!
When it needs to evict an item, Redis performs random sampling of the entire keyspace and selects K candidates. Then it choosed the item with the least recently used timestamp among those K candidates and vacates it. This way, Redis saves 16 bytes per entry needed for ordering items in one global order. This heuristic is a very rough approximation of an LRU.Redis maintainers have recently discussed the possibility of adding an additional heuristic to Redis by implementing a classic LRU policy with global order but eventually decided against it.