On 04/11/2013 07:29 PM, Fujii Masao wrote:
> On Thu, Apr 11, 2013 at 10:25 PM, Hannu Krosing <hannu@2ndquadrant.com> wrote:
>> You just shut down the old master and let the standby catch
>> up (takas a few microseconds ;) ) before you promote it.
>>
>> After this you can start up the former master with recovery.conf
>> and it will follow nicely.
> No. When you shut down the old master, it might not have been
> able to send all the WAL records to the standby.
In what cases (other than a standby lagging too much or
not listening at all) have you observed this ?
> I have observed
> this situation several times. So in your approach, new standby
> might fail to catch up with the master nicely.
the page http://wiki.postgresql.org/wiki/Streaming_Replication claims this:
* Graceful shutdown
When smart/fast shutdown is requested, the primary waits to exit
until XLOG records have been sent to the standby, up to the
shutdown checkpoint record.
Maybe you were requesting immediate shutdown ?
Regards
Hannu Krosing