In my case:
1.The backend servers represent a same micro-service(may be contains 10 
machines) serving the same APIs.
2.The proxy is based on pure Netty(no gRPC included). but clients and 
backend servers are developed on gRPC.
I am not sure if one Netty channel can represents multiple connections to 
multiple backends?

在 2016年12月2日星期五 UTC+8上午1:11:03,Carl Mastrangelo写道:
> This depends on how homogeneous your backends are.  For example, if your 
> proxy going to the same logical set of backends each time, (even if they 
> are distinct machines) then yes this is possible with gRPC.  In gRPC, a 
> channel represent a higher level concept than a single client.  It 
> represents multiple connections to multiple backends (a.k.a. Servers).
> In your case, it seems like you should build a map of hostname (a.k.a. 
> "target") to Channel and pick the correct channel to serve requests to in 
> your proxy.   This works well if you are handling a small number hostnames. 
>  Each channel will have its own tcp connections, but there will be few 
> total channels.
> You can do more advanced things too with your host name.  If the backends 
> that you send traffic to route requests based on the host name, but each 
> backend can handle the requests of other host names, then you can reduce 
> the number of connections even further.  For example, if you know that  
> and both physically point to the same 
> set of servers, then they can both share the same channel.  In your 
> channel, you can override the "authority" field but still reuse the same 
> connection.
> We can provide a better answer if you could share a little more detail 
> about what you want to do.
> On Thursday, December 1, 2016 at 8:59:45 AM UTC-8, killjason wrote:
>> (moved from:
>> Imagine there are 10k grpc-clients, they established 10k http2 
>> connections(TCP-connections) with the http2 reverse proxy; then http2 
>> reverse proxy create 10k http2 connections(TCP-connections) to the 
>> origin(backend) server.
>> Is it possible to reduce the 10k connections between proxy and 
>> origin(backend) server?
>> for example, can a connection pool be used in reverse proxy to reduce 
>> connections with backend server?
>> This picture can explain better:
>> [image: image]
>> this picture is in Nginx blog, Is it possible to do the same thing to 
>> reduce connections with backend serevrs using http2-reverse proxy?

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