17 Jun
2012
17 Jun
'12
9 p.m.
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(a)systemonenoc.com>
Subject: Re: [sr-dev] [SR-Users] New developer - Vicente Hernando
To: "Olle E. Johansson" <oej(a)edvina.net>
Cc: Development mailing list of the sip-router project
<sr-dev(a)lists.sip-router.org>
Message-ID: <4FDB2A08.4090902(a)systemonenoc.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 06/15/2012 02:12 PM, Olle E. Johansson wrote:
in other databases?
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
/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(a)edvina.net
* Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden