Re: [tarantool-patches] [PATCH v2] iproto: introduce a proxy module.

[Vladimir Davydov <vdavydov.dev@gmail.com>]

On Tue, Oct 02, 2018 at 09:05:54PM +0300, Serge Petrenko wrote:
> By default, upon new client connection, all requests from the client are
> forwarded through "guest" connection. Upon recieving an AUTH request,
> proxy processes it on a local instance (this can be done, since proxy is
> being run on one of the cluster instances and has access to user data).
> If auth is successful, new client requests are forwarded through
> corresponding user connection, otherwise, proxy keeps forwarding request
> through guest connection.

Before diving in the code, I'd like to inquire why you think that a
proxy should forward all user connections with the same credentials
through a single connection to the master. AFAIU this complicates the
implementation quite a bit and may negatively affect performance as
this design implies joggling with sync sequences.

What if the user deliberately created several connections so as to
avoid throttling certain transactions on hitting the network buffer
limit? I don't think that it's right to push all requests through
the same queue then.