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From "Thushara Wijeratna" <thu...@gmail.com>
Subject Re: [users@httpd] interaction btn apache and cronolog
Date Sun, 29 Oct 2006 15:09:18 GMT
Seems like the parent apache process creates the pipe to cronolog. The
children must be sending their output to the parent that will in turn
pipe it to cronolog.

The only other thing is that we're using an environment variable
expansion (macro) in the CustomLog string, as described here :

http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/q20201/mod/mod_log_config.html#formats

Any clues as to how I can further debug this is much appreciated.

Thushara

On 10/20/06, Thushara Wijeratna <thushw@gmail.com> wrote:
> Hi Georgi,
>
> Thanks for that info. Digging into this a bit more, I find we're using
> a modified cronolog - sorry I didn't see this before. The one big
> difference seems to be that we're using getc, vs read call to read the
> input in our cronolog.c. I'm suspecting that buffer size mismatch has
> something to do with this (getc would buffer with 8192 and the
> original cronolog seems to buffer 65536 bytes)
>
> Apache writes from multiple child processes cannot be interleaved
> right? Even if we used getc instead of read, shouldn't we still get
> the bytes in the order apache processes wrote them?
>
> Thanks,
> Thushara
>
>
> On 10/11/06, Georgi Chorbadzhiyski <gf@unixsol.org> wrote:
> > Thushara Wijeratna wrote:
> > > Thanks Georgi, in my case there is only one virtual host, but of
> > > course there are around 500 httpd child processes running and writing
> > > into one cronolog.
> > >
> > > That is the part that I couldn't quite grasp. When I do a ps auxww, I
> > > see a cronolog process (just 1) all the time, so it sure looks like
> > > all the httpd children are writing to this one cronolog process.
> > >
> > > Tp avoid corruption, should we have one cronolog process for each
> > > httpd child, instead?
> >
> > Oh no, that would be overkill and I don't think it is even possible to
> > make such configuration. May be there is some bug in cronolog. I've
> > used cronolog on some pretty heave loaded sites and never saw such a
> > problem like yours.
> >
> > Can you try rotatelogs program from apache distribution and see if the
> > problem persists.
> >
> > --
> > Georgi Chorbadzhiyski
> > http://georgi.unixsol.org/
> >
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