Re: Streaming replication and non-blocking I/O

On Fri, Dec 18, 2009 at 11:42 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> Okey. Design clarification again;
>
> 0. Begin by connecting to the master using PQconnectdb() with new conninfo
> option specifying the request of replication. The startup packet with the
> request is sent to the master, then the backend switches to the walsender
> mode. The walsender goes into the main loop and wait for the request from
> the walreceiver.
<snip>
> 4. Start replication
>
> Slave -> Master: Query message, with query string "START REPLICATION:
> XXXX", where XXXX is the RecPtr of the starting point.
>
> Master -> Slave: CopyOutResponse followed by a continuous stream of
> CopyData messages with WAL contents.

Done. Currently there is no new libpq function for replication. The
walreceiver uses only existing functions like PQconnectdb, PQexec,
PQgetCopyData, etc.

git://git.postgresql.org/git/users/fujii/postgres.git
branch: replication

Regards,

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