Leo,
make your process a resource that changes state over time.
Jan
On 25 Feb, 2011,at 10:18 AM, Leo Romanoff <romixlev_at_yahoo.com> wrote:
>
> Hi,
>
> I have implemented a Jersey-based front-end for a very stateful service with
> a lot of state. The exposed APIs of this service are:
> - startSession (starts a long running process, returns process id)
> - readSessionState (get current snapshot of the process state)
> - stopSession (stop a long running process with a given id)
>
> The stateful service is running on the cluster. Currently, no failover is
> supported, which means that if a long running process is started in node X,
> it continues to run on node X. All subsequent requests related to this
> process should go to the same cluster node X.
>
> Now, I'd like to make the Jersey-based front-end for this service also run
> in the cluster mode. To achieve that I'd like to use load-balancing of
> incoming startSession requests between nodes to produce an even load on
> cluster members. And I need to achieve that all subsequent readSessionState
> and stopSession requests land at the right cluster node, that was picked for
> the initial startSession request.
>
> Probably some sort of a cookie should be provided? Or may be internal
> request rebalancing, i.e. if a request lands at the wrong node, it is
> redirected by the wrong node to the right one?
>
> At the moment, I don't see any very obvious solution for that. Therefore I'd
> like to ask on this forum, what kinds of solutions can be used to solve the
> mentioned problem?
>
> Thanks,
> Leo
>
> P.S. NOTE: I know that a stateful service is not a good idea from the REST
> point of view. But its statefulness cannot be changed - it is a big legacy
> system and not a subject to change. The reason for providing a Jersey
> front-end for this service is to make this service easily usable from
> AJAX-apps and other Web applications.
>
> --
> View this message in context: http://jersey.576304.n2.nabble.com/Providing-a-stateful-JAX-RS-service-in-a-cluster-tp6063881p6063881.html
> Sent from the Jersey mailing list archive at Nabble.com.