[ANN] ram, an in-memory distributed KV store
Tue Dec 21 14:57:09 CET 2021
Let’s write a database! Well not really, but I think it’s a little sad that
there doesn’t seem to be a simple in-memory distributed KV database in
Erlang. Many times all I need is a consistent distributed ETS table.
The two main ones I normally consider are:
- *Riak* which is great, it handles loads of data and is based on DHTs.
This means that when there are cluster changes there is a need for
redistribution of data and the process needs to be properly managed, with
handoffs and so on. It is really great but it’s eventually consistent and
on many occasions it may be overkill when all I’m looking for is a simple
in-memory ACI(not D) KV solution which can have 100% of its data replicated
on every node.
- *mnesia* which could be it, but unfortunately requires special
attention when initializing tables and making them distributed (which is
tricky), handles net splits very badly, needs hacks to resolve conflicts,
and does not really support dynamic clusters (additions can be kind of ok,
but for instance you can’t remove nodes unless you stop the app).
- …other solutions? In general people end up using Foundation DB or
REDIS (which has master-slave replication), so external from the beam.
So… :) Well I don’t plan to write a database (since ETS is *awesome*),
rather distributing it in a cluster. I’d simply want a distributed ETS
solution after all!
I’ve already started the work and released a version 0.1.0 or ram:
Docs are here:
Please note this is a very early stage. It started as an experiment and it
might remain one. So feedback is welcome to decide its future!
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