GitHub - martinsumner/leveled: A pure Erlang Key/Value store - based on a LSM-tree, optimised for HEAD requests · GitHub was mentioned during CodeBEAM in a talk presenting how Riak is used at NHS. It’s a pure-erlang implementation of a key-value store that is designed to replace eleveldb as a backend for Riak.

For local KV storage I tend to use either DETS (single-load use), mnesia (persistant save/load use), or leveldb (for high speed data that might exceed 2 gigs).

Overall I default to mnesia.

Preference I guess. Mnesia provides more features then either rocksdb or lmdb but also has some issues with file loading times, maximum file sizes, repair times on corrupted files, etc. IIRC Klarna built a backend for mnesia in leveldb (which is what rocksdb is based on) in order to solve those issues. If you just need keys and values on a single file system then rocksdb is what I would use. If you want the extra features of mnesia and you don’t have a ton of data to store then mnesia is probably fine.

Aw thanks! Happy to hear you’re enjoying it.

If you just need a quick lookup for KVs and don’t need persistence then ETS is going to be your best bet. I haven’t benchmarked dets or any other “native” elixir solution vs. the rocksdb nif so I can’t say what the performance implications are. Personally I use rocksdb because its “very fast” and its seen tons of use across many companies and solutions. So I trust it to be reliable.