Hi Guy , >>> Is it enough that the external ODL and the 3 ODLs will be connected with an >>> AKKA cluster, or does it have to be part of the ODL cluster, or maybe it's >>> just the same? For routed-rpc, it has to be part of ODL cluster because the routee address map is synchronized via ODL's own gossip mechanism using Akka cluster as 'transport'
>>> in an async way. Ok. Got it. Async is the catch in your case. So, alternative like RESTCONF based RPC (which I had suggested in my previous mail) may also be of no significant use unless RPC output semantics is something on lines of 'request accepted' if at least that level of synchronous call is tolerable. Regards Muthu From: Sela, Guy [mailto:guy.s...@hpe.com] Sent: Thursday, August 25, 2016 1:25 PM To: Muthukumaran K; mdsal-...@lists.opendaylight.org; controller-dev@lists.opendaylight.org Cc: Alfasi, Shlomi; Cohen, Elad Subject: RE: Invoking MD-SAL RPC's from outside the cluster Hi Muthu, I'm familiar with the Routed-RPC model. The usecase I'm talking about is just a normal RPC, not a routed one. I want the external ODL to invoke an RPC on each of the 3 ODLs in the cluster. I want to focus on what you said in the end. Is it enough that the external ODL and the 3 ODLs will be connected with an AKKA cluster, or does it have to be part of the ODL cluster, or maybe it's just the same? In our deployment, we are talking about a multi-site deployment. It means we have N ODL-clusters, and a single ODL for monitoring and orchestration of the clusters. I want this single/external ODL to be able to invoke remote methods on each ODL instance in each cluster, in an async way. I don't think I can really use the standard ODL tools, because it means I need to hold a reference to an RPCRegistry, and from my understanding, the scope of the RPCRegistry is the cluster-scope. From: Muthukumaran K [mailto:muthukumara...@ericsson.com] Sent: Thursday, August 25, 2016 10:41 AM To: Sela, Guy <guy.s...@hpe.com<mailto:guy.s...@hpe.com>>; mdsal-...@lists.opendaylight.org<mailto:mdsal-...@lists.opendaylight.org>; controller-dev@lists.opendaylight.org<mailto:controller-dev@lists.opendaylight.org> Cc: Alfasi, Shlomi <shlomi.alf...@hpe.com<mailto:shlomi.alf...@hpe.com>>; Cohen, Elad <elad.coh...@hpe.com<mailto:elad.coh...@hpe.com>> Subject: RE: Invoking MD-SAL RPC's from outside the cluster Hi Sela, You might want to look into the Routed-RPC option for this if your performance requirements are not so severe. To illustrate, in Openflowplugin, every switch in effect exposes a RPC and registers itself with the central routed-rpc registry. If a flow has to be provisioning from Node A but the switch is connected to Node B (or Node B is master of switch in OF high-availability lingo), RPC call from Node A gets routed by MD-SAL infrastructure to Node B's RPC-provider of given switch. I am not sure about your deployment model. But an important pre-requisite for above to work is that both RPC consumer(S) and RPC provider(s) must be on same Akka cluster Hope this helps Regards Muthu From: controller-dev-boun...@lists.opendaylight.org<mailto:controller-dev-boun...@lists.opendaylight.org> [mailto:controller-dev-boun...@lists.opendaylight.org] On Behalf Of Sela, Guy Sent: Thursday, August 25, 2016 1:01 PM To: mdsal-...@lists.opendaylight.org<mailto:mdsal-...@lists.opendaylight.org>; controller-dev@lists.opendaylight.org<mailto:controller-dev@lists.opendaylight.org> Cc: Alfasi, Shlomi; Cohen, Elad Subject: [controller-dev] Invoking MD-SAL RPC's from outside the cluster Hi, Let's say I have a cluster of 3 ODLs, and I have another external ODL that is not part of the Cluster. Can this external ODL invoke RPCs on the ODLs in the cluster? The current MD-SAL RPC framework allows me to invoke RPCs on remote machines in an async way, giving me a Future. I want the same capability for a machine that doesn't live in the cluster. If the answer is no, what do you think will be the best way to do it? What we are trying to achieve is very similar to this library: https://github.com/barakb/asyncrmi/ Thanks, Guy Sela
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