Hello,
On 11/14/11 3:24 PM, Javier Gallart wrote:
Hello
very interesting issue actually...the mtree module fits perfectly well
in a key-value model becaue basically is what the mtree table
structure defines; that's why redis was the first thing that came to
my mind when I saw the redis module. Two problems with redis:
-no "native" mt_match function, up to the user to find the best option
-replication. Until the cluster feature is ready, we need to change by
hand the server ip address, which implies a kamailio restart. There is
no mi command for changing the server in the fly, right..(not in the
module documentation at least)?
you cannot change the redis server attributes on the fly, but you can
define many redis servers and based on the name attribute query a
specific one. So if you define two, you can do round robin queries to
both of them, by using a shared variable $shv(...) to know which one was
used last time. In the same way, since $sht(...) can be changed via MI,
you can query either first redis or second one, based on the value of
$sht(). In this way you can build some failover solution just in config
file of kamailio.
Cheers,
Daniel
Daniel, I agree that your suggestion about the mi/rpc method would be
nice. I will also take a look at Mongo as Douglas suggests, and
especially CouchDB, because you can talk to Couch DB via http...
Regards
Javi
On Mon, Nov 14, 2011 at 1:32 PM, Douglas Hubler <doug...@hubler.us
<mailto:doug...@hubler.us>> wrote:
On Mon, Nov 14, 2011 at 5:10 AM, Daniel-Constantin Mierla
<mico...@gmail.com <mailto:mico...@gmail.com>> wrote:
> are there any other no-sql database systems that have such
mechanism? Might
> not be hard to make a connector when the time will allow -- just
to know the
> best options here.
mongodb will auto promote. Caveat, (like redis if i understand
correctly), is that all writes are directed to a single master (be it
chosen dynamically), but reads can happen anywhere to spread the load.
Also, you need to accept the distaster scenario of a "network
partition" where a minority set of servers find themselves w/o a
master. Example: 5 servers in datacenter #1 and 4 servers in
datacenter #2. If the link between datacenters is broken, then all
servers in datacenter #2 will not have a master and will be read-only
until link is restored. Good part about single master is there's no
chance of inconsistent data.
Turns out local fail-over v.s. consistent data is a well explored
area.
http://blog.nahurst.com/visual-guide-to-nosql-systems
I've worked w/the C++ driver to mongodb is anyone has questions.
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--
Daniel-Constantin Mierla -- http://www.asipto.com
Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kat
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