18 Jul
2008
18 Jul
'08
3:57 a.m.
I also use HA and DRBD. As long as there are not too many write
operations, the performance is just fine (reads are always local to the
current machine, writes have to be committed first on the target machine).
Best regards
Peter
Watkins, Bradley schrieb:
You are correct that 5.1.23 is that last version that came with NDB built-in, but you do
not have to compile from source.
You can download the latest open-source version of NDB Cluster here:
http://dev.mysql.com/downloads/cluster/index.html
One of the new features in 5.1.X/NDB 6.2.x (might've been part of NDB 6.1.x too, I
forget) is the ability for VARCHAR columns to only use the memory required to store the
value rather than a fixed amount. Depending on your data, this can save a lot of memory.
Of course, as already mentioned, there is also the possibility to use on-disk tables now
though all indexes are stored in-memory. I will say from my experience that you should
spend some time ensuring that your queries use as few non-index columns in the WHERE
clause as possible if you go this route. This probably isn't a problem for the
standard OpenSER/CDRTool queries I expect, but just a caveat.
FWIW, I use MySQL Cluster with OpenSER as well as several other open-source applications
and can say I'm pretty happy with it.
Regards,
- Brad
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-----Original Message-----
From: users-bounces(a)lists.openser.org
[mailto:users-bounces@lists.openser.org] On Behalf Of
Stanislaw Pitucha
Sent: Thursday, July 17, 2008 5:40 AM
To: users(a)lists.openser.org
Subject: Re: [OpenSER-Users] openser + mysql clusters
----- "Sajith T S" <sajith(a)gmail.com> wrote:
I actually use Linux-HA + LVS + ldirectord, though your suggestion is a less complicated
alternative that should work fine.
How is the overall experience like re. deploying
openser with mysql
clusters?
Good enough. Just setup A record pointing at 2 or more api
nodes and set them up with virtual ips (heartbeat works quite
well...). Openser will recover if one of the nodes fail.
Are there
gotchas etc that need to be taken care of? (For
example, a 2006 article [1] says that "The MySQL NDB engine
currently
runs its database completely in memory. This
means that you have to
be
able to fit your database in memory." But this is not documented as
a
limitation in mysql faq.)
It's a feature and it's in the first sentence of cluster
overview: "... enables clustering of in-memory databases" ;)
Gotchas:
- don't bother with 5.0 - it's got strange issues
- 5.1.23 was the last version of 5.1.X with ndb. Now you have
to compile carrier grade edition from source.