1) I want an RPC to each instance of ODL in each cluster, which means if I have 3 instances in a cluster, and 2 clusters, I will invoke 6 RPCs. So it sounds like an HA proxy is not needed.
2) Just to make sure I understand your suggestion. a. The scope of the RPCRegistry is indeed the cluster scope, and I can't really use "low-level" RPCs from outside the cluster. b. You are offering to invoke the RPC with JSON and RESTCONF. Does RESTCONF today offers an async Java implementation that will give me a Future? If yes, this Future will hold just the JSON return value of the RPC, not the actual result right? So the suggestion would be to implement a framework over this to convert it to the actual Binding objects? Does YANGTOOLS give me some framework for this today? c. Because in my usecase I'm talking about invoking API that still doesn't exist, I could theoretically implement this without RPCs. It sounds to me like it's much easier, faster, and less bug-prone to implement it with some kind of AsyncRMI, like this: https://github.com/barakb/asyncrmi/. What are your thoughts about this alternative? From: controller-dev-boun...@lists.opendaylight.org [mailto:controller-dev-boun...@lists.opendaylight.org] On Behalf Of Muthukumaran K Sent: Thursday, August 25, 2016 10:57 AM To: Muthukumaran K <muthukumara...@ericsson.com>; Sela, Guy <guy.s...@hpe.com>; mdsal-...@lists.opendaylight.org; controller-dev@lists.opendaylight.org Cc: Cohen, Elad <elad.coh...@hpe.com>; Alfasi, Shlomi <shlomi.alf...@hpe.com> Subject: Re: [controller-dev] Invoking MD-SAL RPC's from outside the cluster Sorry I missed out the part I have another external ODL that is *not part of the Cluster* In such a case, invoking RPC via RESTCONF with a HA proxy (just to ensure the RESTCONF call land up in only one of 3 nodes) would be an option. RPC consumer must be able to create required input JSON and be able to interpret RPC output JSON as per the RPC yang model of provider Better alternative if HA Proxy is not preferred, there is a latest addition to ODL named Cluster Wide Singleton service - design document - https://bugs.opendaylight.org/attachment.cgi?id=1059 You may want to take a look at this enhancement - https://bugs.opendaylight.org/show_bug.cgi?id=5421 Regards Muthu From: Muthukumaran K Sent: Thursday, August 25, 2016 1:11 PM To: 'Sela, Guy'; 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: 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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