Hi ok, interesting, I didn't know this. My doubt about connections originated by seeing that by default 12 connections are created, of which only one per destination is used.
Abdul Alhazred wrote: > > Do you actually NEED multiple connections? > > IIRC each Session is effectively a thread of execution. I'm not sure how > exactly pulling messages off the > connection is implemented without going through the code, but just from a > basic understanding of how > JCA and the J2EE container normally manage resources it wouldn't seem to > me to be required to have > several connections. As messages come in on the one connection they should > get dispatched to the > MDB container in parallel via different sessions (or at least the internal > implementation aught to be the > same effect). I guess the results could depend on J2EE container > internals, but it seems to me any good > implementation should give good performance with one connection in > general. > > > drvillo wrote: >> >> Hi all >> >> I have some problems understanding how connection/session >> pooling with jencks works, I would apreciate if someone could give me >> some help... >> >> >> I understand the use of maxSessions on an activationspec, and also >> what the threadpool attribute of a JCAContainer is for. >> What I don't get, is why if I specify maxSessions=1 I still >> see that messages are consumed by multiple threads (looking >> at the logs). This is in principle fine with me, as threads are retrieved >> by a pool but reading this >> http://www.nabble.com/-activemq-user--maxSessions-limits-messages-fetched--tf254599.html#a773237 >> it seems that I should see always the same one consuming messages. >> >> Another thing about pooling: why I get always >> a single subscription on a queue, even if pooling the listeners with a >> TargetSourceMessageListener? What is the point of having a pool >> of identical stateless listeners if they all share the same connection? >> >> My primary objective is to maximize throughput, thus I'd like to have >> a pool of listeners which consume messages using multiple connections, >> is it possible to do so using a single JCAConnector or I have to >> statically declare more of them? >> >> Wrapping up, are these two arguments (tweaking maxSessions, threadPool >> and such, and >> having more parallelism) related? >> >> I hope someone can help me on this, it's pretty hard to tune a system >> without understanding the effect of its parameters... >> >> Thanks a lot >> Francesco >> >> >> > > -- View this message in context: http://www.nabble.com/Configuring-session-connection-pooling-to-maximize-throughput-tf2925304.html#a8235347 Sent from the ActiveMQ - User mailing list archive at Nabble.com.
