On 13/09/10 13:08, Fujii Masao wrote:
Hi,
http://archives.postgresql.org/pgsql-hackers/2010-05/msg00921.php
(2)
pg_ctl -ms stop emits the following warning whenever there is the
backup_label file in $PGDATA.
WARNING: online backup mode is active
Shutdown will not complete until pg_stop_backup() is called.
This warning doesn't fit in with the shutdown during recovery case.
Since smart shutdown might be requested by other than pg_ctl, the
warning should be emitted in server side rather than client, I think.
How about moving the warning to the server side?
Hmm, I'm not sure whether that's a good idea or not. Perhaps we
should discuss for 9.1?
Okay, this is not a critical problem.
Let's revisit this issue. The problem here is that pg_ctl might emit
the following warning messages when it shuts down the standby server.
This is very strange thing since online backup mode is never active
in the standby.
WARNING: online backup mode is active
Shutdown will not complete until pg_stop_backup() is called.
Another problem is that the above useful messages are not emitted
when shutdown is requested by other than pg_ctl.
The attached patch moves the warning from pg_ctl to the server side
and makes postmaster emit it only when online backup mode is really
active. This can urge users to call pg_stop_backup to complete smart
shutdown whenever it's requested during online backup. I added the
patch into the next CF.
There's this comment by Robert Haas:
http://archives.postgresql.org/pgsql-hackers/2010-05/msg01433.php
Like Robert, I'm also a bit worried that this might make the message
less prominent. When you run "pg_ctl stop" manually, it's good to get
the message directly in the terminal.
Another line of attack is to remove the backup_label file earlier during
recovery. We could remove it as soon as we update pg_control file with
the same information, ie. the backup start location. And by remove I
mean rename to backup_label.old, to avoid destroying forensic
information ;-).
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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