On Aug 22, 12:07 am, Jim <jim.heffe...@gmail.com> wrote:
> Hello,
>
> I have Django running under apache2 (the worker version, I believe,
> with MaxRequestsPerChild set to the default, which is 0). I am using
> mod_wsgi in daemon mode. I have checked that it is daemon mode using
> the method described on mod_wsgi's ReloadingSourceCode page.
>
> I need to do a nightly refresh because I get data for the db from a
> coworker somewhere else. So I have a cron job that does as follows.
>
> (1) Sets a flag "SITE_UP=False" in the code base file "site_up.py"
> that shows up in each RequestContext, causing each dynamic page to say
> "site is not up" since base.html looks for that flag {{SITE_UP}}.
> (2) Touches django.wsgi so pages will tell visitors the site is not
> up.
> (3) Updates the dB
> (4) Sets the flag from (1) back to its starting value
> "SITE_UP=True".
> (5) Touches django.wsgi.
>
> (Step (3) takes perhaps a half hour. If there is a better way to do
> what I am trying to do, I'd be very glad to hear it.)
>
> The problem is: I come in the next morning and sometimes the pages
> work, while sometimes they say "Site is no up".
>
> If I keep refreshing a page in my browser then sometimes it works
> correctly and gives me the new data, and sometimes it says "not up."
>
> If I restart apache, the problem of showing "not up" disappears.
>
> I had thought that Apache's children talk to the wsgi processes (I
> have 4 of them), which mod_wsgi's ReloadingSourceCode page tells me
> will be restarted. But obviously I'm not understanding something.
>
> I wonder if anyone has a suggestion about how I am going wrong? I was
> hopeful of finding a way to accomplish this without having to restart
> apache from a cron job.
Set Apache directive LogLevel to 'info' instead or 'warn'. This will
cause mod_wsgi to log information about when it is restarting
processes. Analyse that and see if anything stands out.
BTW, what version of mod_wsgi are you using? Update to mod_wsgi 3.3 if
you are using an old version.
Graham
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