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From "Juan Jose Comellas" <jcomel...@gmail.com>
Subject Re: Topology Question
Date Tue, 20 Feb 2007 14:03:21 GMT
PostgreSQL does have several replication solutions. The one I'm using
is Slony-1, which works very well and is available at:
http://www.slony.info.


On 2/17/07, Rob Bugh <robbugh@earthlink.net> wrote:
>
> Thanks for the input, James.
>
> I'm using Postgresql so I don't think there is a DB vendor solution.
>
> Are you suggesting to create different topics for each datacenter or share
> the same topic across all the datacenters?
>
> One of the issues I'm having is exactly where the brokers will be at each
> datacenter. I don't have extra hardware for the brokers so they'll have to
> live on the Tomcat servers. My first thought was to make them run as
> resources within the Tomcat instances. Are you aware of any issues setting
> up a Master/Slave configuration this way?
>
> I forgot to mention previously that the number of datacenters may grow in
> the future so it would be nice if the solution required a minimum of changes
> to add a new datacenter.
>
> Regards,
> Rob
>
>
> James.Strachan wrote:
> >
> > On 2/15/07, Rob Bugh <robbugh@...t> wrote:
> >>
> >> Hello All,
> >>    Is this the forum to ask How-To questons with regards to deploying
> >> ActiveMQ in a given topology?
> >
> > Sure!
> >
> >> My topology
> >> --------------
> >> In a nutshell, I have several datacenters that need certain data to be
> >> kept
> >> in sync. One datacenter is on the west coast, one is on the east coast,
> >> and
> >> another is in Europe. Each datacenter has its own database, but one table
> >> in
> >> each of the databases needs to be kept in sync with each other. Each
> >> datacenter consists of several Tomcat servers fronted by a load balancer
> >> and
> >> a database server.
> >
> > BTW if all you want is to do database replication, it might be your
> > database vendor has a solution?
> >
> >
> >> I've read through the documentation and it seems that a network of
> >> brokers
> >> may be what I need, but I would like to hear from others that have
> >> similar
> >> topologies. Where things get fuzzy for me is trying to determine exactly
> >> where the brokers will live? My first thought was to put a broker in each
> >> Tomcat instance, running as a resource. This seems like a good choice
> >> since
> >> it provides broker fail over, but how do you, for instance, point the
> >> brokers at the west coast datacenter to the ones at the other
> >> datacenters?
> >> Ideally, I want each datacenter to think of the other datacenters as
> >> having
> >> a single broker instead of several embedded into the Tomcat instances.
> >> Can
> >> one broker connect to another through a load balancer?
> >>
> >> Applications running on the Tomcat instances that wants to update the
> >> table
> >> in the database would publish to a topic. This would allow the message to
> >> be
> >> seen by all of the datacenters. Topic listeners running as a resource in
> >> the
> >> Tomcat instances would receive the message and update the database. The
> >> problem with this is, since a topic is used, all listeners will receive
> >> the
> >> message, correct? Meaning, the database will be updated multiple times,
> >> once
> >> per listeners in a single datacenter. Ideally, I want the database to be
> >> updated once per message.
> >>
> >> What are some other ways to use ActiveMQ to solve this problem?
> >
> > OK here would be my recommendations...
> >
> > Run one or two brokers per data centres using JDBC master/slave to the
> > local DB.
> >
> > Then you can create a durable topic subscription on each data centre
> > to listen for its own set of updates from ther others ; then you can
> > either leave the brokers separate and have multiple consumers in each
> > data centre which connect to each data centre using failover: or you
> > can use a network to store-and-forward messages from broker-to-broker.
> >
> > --
> >
> > James
> > -------
> > http://radio.weblogs.com/0112098/
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Topology-Question-tf3231705s2354.html#a9020160
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>
>

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