[erlang-questions] Did I do it right?

Gleb Peregud <>
Sat Oct 27 09:53:25 CEST 2012

Hello James

Since no one reacted yet, I've skimmed through the code very quickly and it
looks really good - I wouldn't assume it being written by Erlang novice.
The only thing I've spotted, which is rarely done in production grade
Erlang systems is use of non-OTP servers by doing manual looping in spawned
process (although I can see it does handle all sys messages and stuff). Is
there any particular reason to not use gen_server in that case?

Gleb Peregud

On Thursday, October 25, 2012, James Rosenblum wrote:

> Kind and Wise List;
>  For selfish and professional reasons, I regularly attempt medium-to-deep
> dives on interesting technologies (Ruby, Go, etc.), and about 12 months ago
> I started looking at Erlang. I have become a huge fan of the entire Erlang
> Ecosystem and have tried to be a good student.
> Like many, I taught myself by reading the usual books, going to the usual
> websites, looking at existing projects, following this list and
> participating in stackoverflow.  And, like many I suspect, I wrote a cache
> ;)
> What I wrote could solve a problem for my company which builds and deploys
> an enterprise application which needs to cache domain-objects (assembled
> from a variety of Oracle or MSSQL tables) and provide them to web clients.
> We currently use an in-process cache that is part of a fairly typical
> Java-stack application. Unfortunately it is difficult to cluster, and it
> doesn't provide us with the level of control and specialization that we
> would like. A successful cache needs to be available on 2 or 3 nodes for
> redundancy and to handle load. There are 200 - 400 clients producing
> about 50 transactions per second bursting to about 200 transactions per
> second for a few minutes at a time (probably 80% reads). Our software is
> installed in customer's data centers - no public Internet involvement. What
> I wrote would seem to fulfill these requirements.
> As a company, based on my enthusiasm, we are considering Erlang, and my
> cache is going to be looked at as a reference implementation, learning tool
> and poc.
> What I don't know is: Did I create a piece of crap example of Erlang that
> does the entire community a disservice; or, did I do a reasonable job of
> representing what could, and should, be done with the technology?
> If anyone is feeling charitable, and wouldn't mind helping develop a good
> Erlang Citizen, I would appreciate any comments or suggestions on what I
> have done.
> It can be found at https://github.com/jr0senblum/JCache
> If this is an inappropriate request, I apologize and please feel free to
> ignore this all together.
> Thanks in advance,
> Jr0
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