Ehancement: upgrade gRPC version from 1.26 to 1.36

[AlexStocks]

What would you like to be added:

upgrade gRPC version.

Why is this needed:

using latest gRPC.

[AlexStocks]

cc @gaoxinge

[gaoxinge]

I think the difficult thing is that we should upgrade the version of etcd. This is because etcd does not use go module before v3.5.0 ([1], [2]).

Now the latest version of github.com/coreos/etcd is v3.3.25+incompatible ([3]), and highest compatible version of grpc is v1.26.0. So we can not directly upgrade grpc to higher version.

In addition, github.com/coreos/etcd@v3.5.0 will release in the mid of 2021 ([4]), and it may introduce incompatible and conflict codes with dubbogo.

[AlexStocks]

I think the difficult thing is that we should upgrade the version of etcd. This is because etcd does not use go module before v3.5.0 ([1], [2]).

Now the latest version of github.com/coreos/etcd is v3.3.25+incompatible ([3]), and highest compatible version of grpc is v1.26.0. So we can not directly upgrade grpc to higher version.

In addition, github.com/coreos/etcd@v3.5.0 will release in the mid of 2021 ([4]), and it may introduce incompatible and conflict codes with dubbogo.

ok. I got what u said. let's keep this issue until the autumn of 2021.

we just upgrade gRPC to 1.26 now.

[gaoxinge]

I have updated grpc from 1.26.0 to 1.29.1. I will try to update it to 1.36 later. @AlexStocks

[gaoxinge]

#1203 have updated etcd and grpc to latest version and it still needs

dubbo-go/go.mod

Line 70 in 65774dc

google.golang.org/grpc => google.golang.org/grpc v1.29.1

because of the consul depends the grpc v1.15.1.

But I think we can slow down the pace to update the verion of grpc, and focus on other issues. @AlexStocks @ztelur