You should not have to use a separate connection for every RPC call. The 
`grpc.ClientConn` returned from a call to `grpc.Dial` manages connections 
to multiple backends under the covers. And even if there are not multiple 
servers to connect to, each RPC is only a stream, and streams can be 
multiplexed on a single connection.

Are you sure you are not blocking the main server thread in someway that is 
not allowing you to serve more than one RPC at a time?

On Friday, May 14, 2021 at 1:19:52 PM UTC-7 Asha Prabhakaran wrote:

> Hi,
> I have a golang GRPC client and a C++ GRPC server providing a synchronous 
> service.
> We have been using a new connection for every RPC call.
> When I attempt to use the same connection for multiple concurrent RPC 
> calls, only one of them succeeds whereas the others keep waiting.
> Is it possible to use the same connection for concurrent RPC calls?
>
> Connection creation:
> conn, err := grpc.*Dial*(url, c.opts...)
>
> For each RPC:
> client := pb.*NewXXServer*(conn) 
> stream, err := client.*GetXX*(lctx, req)
>

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