Hi, On Thu, Jul 4, 2013 at 5:44 PM, Afkham Azeez <az...@wso2.com> wrote:
> There could be a situation where when a cluster message is sent, a > member momentarily leaves the cluster, but joins immediately. This > generally could happen when the nodes slow down under load, or due to > intermittent network failures. However, this could lead to failures because > crucial cluster messages may not be received by members. > > To overcome this, or reduce the probability of loss of such messages, we > can replay a certain number of messages when a member joins. On the sender > side, messages over a particular time period can be buffered, and then > replayed when new members join. However, we should ensure that the messages > are idempotent, and messages should declare whether they are idempotent or > not. If a message is not idempotent, we will not replay it. All the > messages we have at the moment are idempotent, AFAIK. > > How does this approach sound? > +1. IMHO it is cleaner if we can replay a sequence of cluster messages node which originally was a member of the cluster, and then got removed (due to a network failure, etc) and got re-joint before a certain time period. If we replay a set of messages whenever a new member joins, isn't there a possibility that a newly joined member is updated to a false state? > > -- > *Afkham Azeez* > Director of Architecture; WSO2, Inc.; http://wso2.com > Member; Apache Software Foundation; http://www.apache.org/ > * <http://www.apache.org/>** > email: **az...@wso2.com* <az...@wso2.com>* cell: +94 77 3320919 > blog: **http://blog.afkham.org* <http://blog.afkham.org>* > twitter: **http://twitter.com/afkham_azeez*<http://twitter.com/afkham_azeez> > * > linked-in: **http://lk.linkedin.com/in/afkhamazeez* > * > * > *Lean . Enterprise . Middleware* > > _______________________________________________ > Architecture mailing list > Architecture@wso2.org > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- Thanks and Regards, Isuru H.
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