From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
---|---|
To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Streaming replication and non-blocking I/O |
Date: | 2009-12-21 12:56:13 |
Message-ID: | 3f0b79eb0912210456m73871b88pf6cab723c2e0b4dc@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
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
From | Date | Subject | |
---|---|---|---|
Next Message | Heikki Linnakangas | 2009-12-21 12:56:41 | Re: New VACUUM FULL |
Previous Message | Magnus Hagander | 2009-12-21 12:46:30 | Re: Minimum perl version supported |