I guess the edge case I'm thinking about is the Plain ol Single Consumer that crashes. If my crashed program quickly restarts, and starts consuming, I bet the broker would think there are two consumers (until TCP timeouts etc)
Many thanks to all, I can sleep better now. -JD Gary Tully wrote: > > total ordering is only an issue when there are multiple consumers. > For a single consumer and for exclusive consumers, where there can only be > a > single consumer, ordering 'is' guaranteed. > > 2009/8/6 jerdavis <jerda...@speakeasy.net> > >> >> Thanks for your answer Rob, this is exactly what I was looking for. :) >> Total Ordering seems like such a fundamental thing for a Persistent >> Queue. >> I'm surprised there hasn't been a solid answer to this question. Is there >> a >> standard way people get around this? >> Would an Exclusive Consumer guarantee Total Order? >> I would think that a new Exclusive consumer wouldn't be able to consume >> messages until the crashed TCP connection/consumer finally closed and >> released the outstanding messages. >> >> Regards, >> -JD >> >> >> >> >> >> >> rajdavies wrote: >> > >> > >> > On 5 Aug 2009, at 23:13, jerdavis wrote: >> > >> >> >> >> No takers? >> >> -- >> >> View this message in context: >> >> >> http://www.nabble.com/Total-Message-Order-of-Queues-%28not-topics%29-durring-edge-cases%28crashes%29-tp24705154p24837185.html >> >> Sent from the ActiveMQ - User mailing list archive at Nabble.com. >> >> >> > >> > >> > Total ordering may be violated for consumer crashes with the default >> > prefetch sizes - see >> > http://activemq.apache.org/what-is-the-prefetch-limit-for.html >> > to reduce this possibility to a single message - set a prefetch size >> > = 0. >> > >> > cheers, >> > >> > Rob >> > >> > Rob Davies >> > I work here: http://fusesource.com >> > My Blog: http://rajdavies.blogspot.com/ >> > I'm writing this: http://www.manning.com/snyder/ >> > >> > >> > >> > >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Total-Message-Order-of-Queues-%28not-topics%29-durring-edge-cases%28crashes%29-tp24705154p24855824.html >> Sent from the ActiveMQ - User mailing list archive at Nabble.com. >> >> > > > -- > http://blog.garytully.com > > Open Source Integration > http://fusesource.com > > -- View this message in context: http://www.nabble.com/Total-Message-Order-of-Queues-%28not-topics%29-durring-edge-cases%28crashes%29-tp24705154p24868142.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.
