From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
---|---|
To: | aaliya zarrin <aaliya(dot)zarrin(at)gmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Hi- How frequently Postgres Poll for trigger file |
Date: | 2010-12-01 12:23:32 |
Message-ID: | 4CF63E44.1050704@enterprisedb.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On 01.12.2010 13:27, aaliya zarrin wrote:
> I want to know how frequently postgres search for trigger file to switch
> over.
In 9.0, every 100ms while streaming replication is active and connected.
5 seconds otherwise. In current git master branch, it's always 5 s.
> Can this switch over time be reduced?
Not without hacking the sources and compiling.
Although, on many platforms, Linux included I believe, sending a signal
to the startup process should wake it up from the sleep and make it
check the trigger file immediately. "pg_ctl reload" for example should
do it. So if ýou send a signal to the startup process immediately after
creating the trigger file, it should take notice sooner.
> Plz let me know where postgres poll for trigger file. I could find it out in
> "backend/access/trans/xlog.c" ? am i right?
Yes. search for callers of CheckForStandbyTrigger() function.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
From | Date | Subject | |
---|---|---|---|
Next Message | Lew | 2010-12-01 12:27:59 | Re: [HACKERS] Improved JDBC driver part 2 |
Previous Message | Kristian Nielsen | 2010-12-01 11:53:02 | Re: We need index-only scans |