I have however also notice that persistent doesn't appear to handle failover well when in a network of brokers setup. For instance say you have 3 brokers with a consumer attached to each. All connected in a persistent style. If broker 1 goes down and the consumer switches over to broker 2. Any messages passed during that period are lost, but I can understand that, but what goes weird is that when broker 1 comes back online. It still builds up messages to be delivered to the consumer that use to be attached to it.
On Mon, Nov 15, 2010 at 7:37 AM, Johan Edstrom <seij...@gmail.com> wrote: > If you think of persistence in the same way you would a POP3 store, > i.e the object of the persistence store is more to provide reliability in that > > 1: Write incoming message to disk, > 2: Maintain a journal of actions taken to the message > 3: Remove the message from the store once consumed. > > So the persistence would be invoked on every broker that participated in a > message exchange > to ensure consistency across the brokers. There is no master storage nor is a > message 'replicated' to all nodes. > > /je > On Nov 15, 2010, at 7:36 AM, Steve Cohen wrote: > >> I am in the phase of imagining what using ActiveMQ to design a wrapper >> around a legacy process would look like, and reading the book, which I have >> bought. I should say that I am impressed so far with ActiveMQ and the >> mapping of what it does with what I am trying to do seems very good. >> >> I am trying to understand the relation of persistence to the "network of >> brokers" concept. In a single standalone broker deployment, it's simple. >> You either enable persistence of one flavor or another, or you don't. >> >> But what does this look like in the "network of brokers" concept? There is >> something appealing in this model to my situation, of deploying a >> server-side application in which each instance has an instance of the broker >> embedded within it, but what are the consequences in terms of persistence? >> Would there just be one persistent store, with a suitable backup arrangement? >> >> Please help me untangle the consequences of these two concepts, which are >> starting to boggle my mind a bit. >> > > -- Nick Verbeck - NerdyNick ---------------------------------------------------- NerdyNick.com Coloco.ubuntu-rocks.org
