[sr-dev] New developer - Vicente Hernando

[Javier Gallart]

Hello

for us Redis was a great solution for this problem: we run a kamailio based
routing server that needs to handle millions of entries. mtree module
worked great but it had a problem: after every change in the DB you need to
perform a reload in order for the data to be in memory. For several million
entires the reload took more than 3 minutes. That means that we needed to
batch  many changes and do a reload every few minutes (it made no sense to
do a full reload for a single change). We moved to redis an soon as the
ndb_redis module was released. With redis we have these advantages:
-No reload needed, any change is instanly available (no batch either)
-We can access the same redis instance from several servers
-Using redis pipelining and unix sockets (Vicente provided a patch for
using them in ndb_redis module), the performance is really astonishing.

The disadvantage is that you no longer have a mt_match funcion, you have to
build it yourself. The same logic can be applied to other modules that rely
on a db backend but need to be loaded into memory for speed. For small size
data the reload is very fast, but when it starts growing it may take a
while.

Regards

Javi

> Date: Fri, 15 Jun 2012 14:26:48 +0200
> From: Vicente Hernando <vhernando at systemonenoc.com>
> Subject: Re: [sr-dev] [SR-Users]  New developer - Vicente Hernando
> To: "Olle E. Johansson" <oej at edvina.net>
> Cc: Development mailing list of the sip-router project
>        <sr-dev at lists.sip-router.org>
> Message-ID: <4FDB2A08.4090902 at systemonenoc.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 06/15/2012 02:12 PM, Olle E. Johansson wrote:
> > 15 jun 2012 kl. 13:45 skrev Vicente Hernando:
> >
> >> Hello Olle,
> >>
> >> http://redis.io
> >> http://en.wikipedia.org/wiki/Redis
> >> #redis  in irc.freenode.org
> >>
> >> Redis is a non-SQL opensource network data store. It uses a key-value
> structure like a dictionary. Stores strings, and complex data tipes like
> sets, lists, etc.
> >>
> >> It is written in C.  Using hiredis library we can connect from kamailio
> to a running redis server. Kamailio module dealing with redis is named
> ndb_redis.
> >>
> >> Redis data is stored in RAM, and its goal is being very fast.
> >>
> >>
> > Ok. Thanks. But are there things you can do in Redis that can't be done
> in other databases?
> >
> > /O
> Actually, Redis is simpler than other databases. Its goal is speed. It
> tries to achieve high write and read speed.
>
> http://redis.io/topics/faq
> http://redis.io/documentation
>
> Regards,
> Vicente.
>
> >> Regards,
> >> Vicente.
> >>
> >>
> >>
> >> On 06/15/2012 12:34 PM, Olle E. Johansson wrote:
> >>> Vicente,
> >>> Maybe you can take a moment or two and tell us old people about REDIS.
> What is it good for, how can it change how we use Kamailio?
> >>>
> >>> I'm curious.
> >>>
> >>> Thanks!
> >>>
> >>> /O
> > ---
> > * Olle E Johansson - oej at edvina.net
> > * Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden
> >
> >
> >
> >
>
>
>
>
>
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