I too think option 1 is better, given the fact that the second node could trigger the flow controlling upon acceptance of the first few messages if its exhausted.
On Fri, Mar 20, 2015 at 5:55 PM, Asitha Nanayakkara <asi...@wso2.com> wrote: > In MB Flow controlling mechanism is cluster unaware. Hence when one node > enables flow control other node doesn't know about it. > IMO we have two approaches to tackle this. > > - After client retries to connect to killed node (after failing to > connect) it will try to connect to second node. At that time, since we are > connecting to a new node, client can reset all flow control related > information, from client, so that it can publish without waiting for flow > control disable message from second node (That will never be sent to > publisher by second node) > - Or we can send a flow control disable message from MB node when a > publisher connects (If global flow control is not enabled). > > I think the first option is better. > > Regards, > > On Fri, Mar 20, 2015 at 3:32 PM, Pumudu Ruhunage <pum...@wso2.com> wrote: > >> Hi All, >> >> We did fail over testing on mb nodes in AWS instances and came across >> following issue. Following is the scenario tested in cluster. >> >> 1. Start 2 node mb cluster with nodeA (coordinator), nodeB. >> 2. Add queue subscriber "MyQueue" to nodeB. >> 3. Start publish "MyQueue" queue messages to nodeA. >> 4. After flow control enabled in nodeA, disconnect nodeA from the cluster. >> >> At a moment where flow control is enabled for the publisher, the >> coordinator is killed. Even though(assuming) that the publisher moves to >> the other node, it is still under flow control and the node does not >> disable the flow control for the publisher. Therefore the publisher does >> not publish any messages afterwards. How can we overcome this issue ? >> >> Regards, >> -- >> Pumudu Ruhunage >> Associate Software Engineer | WSO2 Inc >> M: +94 779 664493 | http://wso2.com >> > > > > -- > *Asitha Nanayakkara* > Software Engineer > WSO2, Inc. http://wso2.com/ > Mob: + 94 77 85 30 682 > > -- *Pamod Sylvester * *Senior Software Engineer * Integration Technologies Team, WSO2 Inc.; http://wso2.com email: pa...@wso2.com cell: +94 77 7779495
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