Prefetch does not imply blocking the producer. I recommend reading these two wiki links closer. Below are the salient points:
>From http://activemq.apache.org/what-is-the-prefetch-limit-for.html: "ActiveMQ uses a prefetch limit on how many messages can be *streamed to a consumer* at any point in time. Once the prefetch limit is reached, no more messages are *dispatched to the consumer* until the consumer starts sending back acknowledgements" >From http://activemq.apache.org/producer-flow-control.html: "By 'flow control' we mean that if the broker detects that the *memory limit for the destination*, or the temp- or file-store limits for the broker, have been exceeded, then the flow of messages can be slowed down. The producer will be either blocked until resources are available *or* will receive a JMSException" On Fri, May 10, 2013 at 2:46 AM, pp123 <prashantp...@gmail.com> wrote: > Hi , > > I read about prefetch limit and found out that the default value is : 100 > for Durable subscriber. So for testing this what i am doing is : I have > three subscriber in offline mode and I am trying to publish more than 100 > messages expecting after crossing the prefetch limit it should block the > producer . I am publishing 100 messages with in 30 seconds so that it > should > be in memory. Also i have configured producer flow control as: > > <policyEntry topic=">" producerFlowControl="true" > optimizedDispatch="true" memoryLimit="300kb" > cursorMemoryHighWaterMark="30"> > <pendingMessageLimitStrategy> > <constantPendingMessageLimitStrategy limit="0"/> > </pendingMessageLimitStrategy> > </policyEntry> > > One message size is : 1kb .So based on this configuration it is blocking > producer after 150th publish. So i assumed may be the memory is 300kb > =(150kb producer + 150kb consumer) . But according to prefetch limit it > should block after 100 only . I am not able to find any documentation about > these things .Please help . > > > > -- > View this message in context: > http://activemq.2283324.n4.nabble.com/Confusion-Prefetch-Limit-and-producerFlowControl-tp4666880.html > Sent from the ActiveMQ - User mailing list archive at Nabble.com. > -- *Christian Posta* http://www.christianposta.com/blog twitter: @christianposta
