Will take a look. Thank you Larry and Terry! Much appreciated! On Monday, November 6, 2023 at 4:10:09 PM UTC-8 Terry Wilson wrote:
> Krishna, > > I'll mention that we also have a short guide on custom LBs > <https://grpc.io/docs/guides/custom-load-balancing/> that can help you > with the fundamentals. > > On Monday, November 6, 2023 at 3:53:01 PM UTC-8 Larry Safran wrote: > >> Yes, you will need a custom NameResolver. >> You could have your NameResolver do one of the following >> 1) Extend DnsNameResolver (as is done by the internal GrpcNameResolver) >> and override the doResolve method >> 2) Directly extend NameResolver and have a field with a DnsNameResolver >> created through the DnsNameResolverProvider (which should be gotten from >> the registry). >> >> There is already a load balancer that is switching between 2 child load >> balancers. It is experimental and can be specified as >> "priority_experimental". What it does is to use a specific attribute that >> must be set by the NameResolver. Even if you go with your own load >> balancer, that would be the best way to differentiate which addresses >> should be used for which child. If you want to use it as an example, it is >> https://github.com/grpc/grpc-java/blob/master/xds/src/main/java/io/grpc/xds/PriorityLoadBalancer.java >> >> >> >> On Mon, Nov 6, 2023 at 1:53 PM Krishna Sai Veera Reddy < >> krishnasaiv...@gmail.com> wrote: >> >>> Hey Larry, >>> >>> Thank you for your response! Are there any examples out in the wild on >>> how to do this? Also the part that is confusing me is the name resolution. >>> Do we have to add a custom name resolution policy as well so that we get >>> both the LB and round robin IP addresses in `acceptResolvedAddresses >>> <https://github.com/grpc/grpc-java/blob/master/examples/src/main/java/io/grpc/examples/customloadbalance/ShufflingPickFirstLoadBalancer.java#L66>` >>> >>> method in the LB policy? >>> >>> On Friday, November 3, 2023 at 12:50:20 PM UTC-7 Larry Safran wrote: >>> >>>> This is a perfect scenario for a custom LB policy. Since LB policies >>>> form a tree, you could easily have your policy delegate to either a >>>> PickFirst or RoundRobin policy depending on whether or not the LB is up. >>>> Just have your policy define a ForwardingLoadbalanceHelper whose >>>> updateBalancingState passes the picker from the oppropriate downstream >>>> policy. >>>> >>>> On Fri, Nov 3, 2023 at 12:29 PM Krishna Sai Veera Reddy < >>>> krishnasaiv...@gmail.com> wrote: >>>> >>>>> Hello All, >>>>> >>>>> I am working on a gRPC client that connects to a gRPC service fronted >>>>> by an LB but would like the client to automatically fallback to using >>>>> round-robin DNS to directly connect to the backend servers when the LB >>>>> goes >>>>> down. How do I go about this? Would I need to implement my own custom LB >>>>> policy? Any help is appreciated and thanks in advance! >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "grpc.io" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to grpc-io+u...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/grpc-io/df8f4a85-5020-4c68-bb94-cbea67d7c75an%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/grpc-io/df8f4a85-5020-4c68-bb94-cbea67d7c75an%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "grpc.io" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to grpc-io+u...@googlegroups.com. >>> >> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/grpc-io/2e7b95aa-cd66-40f5-bf41-0484fa12892cn%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/grpc-io/2e7b95aa-cd66-40f5-bf41-0484fa12892cn%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/40e8db11-304b-4042-847e-4aca00f9a440n%40googlegroups.com.
