Re: Streaming replication and non-blocking I/O

Fujii Masao wrote:
> On Fri, Dec 18, 2009 at 11:42 AM, Fujii Masao <masao.fujii@gmail.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.

Ok thanks, sounds good, I'll take a look.

--  Heikki Linnakangas EnterpriseDB   http://www.enterprisedb.com