[erlang-questions] MySQL cluster - MnesiaXXL

Pat e <>
Mon Oct 23 19:40:21 CEST 2006


Is Erlang Memcached finished?

Patrick


On 10/23/06, Yariv Sadan <> wrote:
> On 10/22/06, Pat e <> wrote:
> > BTW
> > After all is it wise to gamble (i know all of you will say it isn't :)
> > a site reputation and speed when all Mnesia sh#t blows up into your
> > face... but we need real time, and that is where Mnesia it seems
> > shines!
> > Why real time... well lets say you want AJAX tech implemented for all
> > future 5 million users, with all of them contacting each other RT, and
> > not have single glitch in delivery time and reliability (well
> > something like big phone switch operator), and also have for the ease
> > of use (LOL :) have user data on Mnesia disk tables ;)
>
> I disagree :)
>
> I know what you're thinking:
>
> MySQL = database
> Mnesia = database
> MySQL + Mnesia = 2 databases = SCARY
>
> However, this changes greatly when you change your thinking so that
>
> Mnesia = cache
> MySQL + Mnesia = database + cache = "easy, and everyone is doing it"
>
> (in fact, I believe I've heard of some popular hack called memcachd, no ? :) )
>
> To build your app, all you need besides MySQL is one Mnesia table that
> holds {Node, UserId} tuples. When user A send tries to send a message
> to user B, you look up the tuple where UserId == B and then you go
>
> Node ! {msg, A, B, Msg}
>
> That's it. If you want to render HTML pages that display large amounts
> of data such as user profiles, etc, you user ErlyDB to write the
> horriby complex expression
>
> user:find_id(17)
>
> That's all there is to it.
>
> At least, that's my take on the problem (without knowing much about
> what the problem is) :)
>
>
>
> >
> > I know I'm boring, and that you talked about it many times, but if you
> > don't try - you don't fly (and if you fly, you can also dive easily
> > :=).
>
> And if you are going to fly, use a plane instead of hacking yourself a
> pair of wings :)
>
> BR
> Yariv
>



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