Streaming replication and SSL

On Thu, Jan 14, 2010 at 7:04 PM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> 1. Walsender calls pq_wait() which calls select(), waiting for timeout,
> or data to become available for reading in the underlying socket.
>
> 2. Client issues an SSL renegotiation by sending a message to the server
>
> 3. Server receives the message, and select() returns indicating that
> data has arrived
>
> 4. Walsender calls HandleEndOfRep() which calls pq_getbyte().
> pq_readbyte() calls SSL_read(), which receives the renegotiation message
> and handles it. No application data has arrived, however, so SSL_read()
> blocks for some to arrive. It never does.

What is the trigger of the renegotiation? The backend initiates it
when the amount of data sent exceeds the RENEGOTIATION_LIMIT (which
is defined in src/backend/libpq/be-secure.c). OTOH, I cannot find
the code that the libpq explicitly does that. So I wonder if client
(i.e., walreceiver in this case) really sends the SSL renegotiation
message. Correct me if I'm wrong.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center