Re: [GENERAL] Reduce the time to know trigger_fi​le's existence

On Mon, Sep 3, 2012 at 8:30 AM, Harshitha S <hershetha(at)gmail(dot)com> wrote:
> Hi,
>
> We are trying to introduce a thread that monitors the creation of the
> trigger_file. As and when the file is created, the process that monitors
> postgres server needs to be notified through the inotify API.
>
> This is to reduce the 3-4 seconds delay that exists with the current
> implementation in postgres. As per the current implementation, the thread
> checks for the existence of the file every 5 seconds. If the file got
> created just 1 second after the sleep, there is a wait time of 4 seconds
> before we know whether the file is present or not. We intend to avoid this
> delay by using inotify().
>
> PostgreSQL version number you are running: postgres 9.1.5
>
> How you installed PostgreSQL: Downloaded and compiled the sources
>
>
> Does anyone have suggestions on the appropriate place to add
> inotify_add_watch to achieve our objective?
> Thanks in advance.

"pg_ctl promote" already uses a signal to remove this time delay. Is
there a reason you can't just use this?

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Magnus Hagander
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