Just a side-note: we once had a bug where omfile wrote only on buffer
boundary and thus incomplete lines. I think this was fixed in 8.1905,
but I may be wrong. If you want to pursue the file path, I would
suggest upgrading to the current version and see if the problem you
experience persists. It could, because the two processes (rsyslog
writing and another one reading) are inherently racy.

Rainer

El mar, 2 nov 2021 a las 21:16, Milan Koudelka
(<milan.koude...@gooddata.com>) escribió:
>
> I'm using rsyslog-8.1911.0-7.el8_4.2.x86_64
>
> Milan Koudelka
>
> Principal SW engineer
>
> milan.koude...@gooddata.com
>
> +420 776 313 414
>
>
> Danube House
>
> Karolinská 650/1
>
> 186 00 Prague 8, Czech Republic
>
> Twitter | Facebook | LinkedIn | Blog
>
>
>
>
> On Tue, Nov 2, 2021 at 9:14 PM Rainer Gerhards <rgerha...@hq.adiscon.com> 
> wrote:
> >
> > Which rsyslog version do you use?
> >
> > Rainer
> >
> > Milan Koudelka via rsyslog <rsyslog@lists.adiscon.com> schrieb am Di., 2. 
> > Nov. 2021, 20:18:
> >>
> >> Hi David,
> >> thank you for your answer as well. This is a good hint. I'll remove it.
> >>
> >> I'm trying to solve a problem with high-traffic log files which are
> >> read by the log management system Splunk. Sometimes rsyslog writes
> >> only part of the line, Splunk reads it and then rsyslog finishes the
> >> line. That causes corrupted events in Splunk. I didn't find any
> >> solution for that on Splunk. From the Splunk side, there are
> >> recommendations to wait longer before the file is considered as closed
> >> (Splunk parameters time_before_close). But that didn't help. I hoped
> >> that some fine-tuning of how rsyslog writes the file could help, but I
> >> see that it would be probably even worse with queues.
> >>
> >> Milan Koudelka
> >>
> >> Principal SW engineer
> >>
> >> milan.koude...@gooddata.com
> >>
> >> +420 776 313 414
> >>
> >>
> >> Danube House
> >>
> >> Karolinská 650/1
> >>
> >> 186 00 Prague 8, Czech Republic
> >>
> >> Twitter | Facebook | LinkedIn | Blog
> >>
> >>
> >>
> >> On Tue, Nov 2, 2021 at 7:24 PM David Lang <da...@lang.hm> wrote:
> >> >
> >> > It's almost always a bad idea to use a queue with omfile, it's slower to 
> >> > put the
> >> > messages into the queue than to write them to disk
> >> >
> >> > David Lang
> >> >
> >> > On Tue, 2 Nov 2021, Milan Koudelka via rsyslog wrote:
> >> >
> >> > > Date: Tue, 2 Nov 2021 11:15:29 +0100
> >> > > From: Milan Koudelka via rsyslog <rsyslog@lists.adiscon.com>
> >> > > To: rsyslog@lists.adiscon.com
> >> > > Cc: Milan Koudelka <milan.koude...@gooddata.com>
> >> > > Subject: [rsyslog] (no subject)
> >> > >
> >> > > Hi,
> >> > > I tried to switch some rsyslog configurations to advanced format to
> >> > > fine-tune actions.
> >> > >
> >> > > Instead of
> >> > > local1.* /mnt/log/gdc;RawMsg
> >> > >
> >> > > I wrote
> >> > > local1.* action(type="omfile" file="/mnt/log/gdc" template="RawMsg"
> >> > > ioBufferSize="128k" queue.size="50000" queue.type="linkedlist"
> >> > > queue.filename="gdc")
> >> > >
> >> > > As recommended, I kept other configurations as they were, if I don't
> >> > > need any advanced configuration.
> >> > >
> >> > > Eg.
> >> > > *.info;mail.none;authpriv.none;cron.none /mnt/log/messages
> >> > >
> >> > > But, I also changed legacy setting of file group ownership
> >> > > $FileGroup splunk
> >> > > $FileCreateMode 0640
> >> > > $DirGroup splunk
> >> > > $DirCreateMode 0650
> >> > >
> >> > > And I've put that directly to module load
> >> > > module(load="builtin:omfile" Template="RSYSLOG_TraditionalFileFormat"
> >> > > fileGroup="splunk" FileCreateMode="0640" dirGroup="splunk"
> >> > > DirCreateMode="0650")
> >> > >
> >> > > The problem is, only the files configured with advanced format are
> >> > > created with the correct group owner. /mnt/log/messages is created
> >> > > under root user. Do I need to add back the legacy setting and keep
> >> > > both in-module and legacy setting?
> >> > >
> >> > > Milan Koudelka
> >> > > Principal SW engineer
> >> > > milan.koude...@gooddata.com
> >> > > +420 776 313 414
> >> > >
> >> > > Danube House
> >> > > Karolinská 650/1
> >> > > 186 00 Prague 8, Czech Republic
> >> > > Twitter | Facebook | LinkedIn | Blog
> >> > > _______________________________________________
> >> > > rsyslog mailing list
> >> > > https://lists.adiscon.net/mailman/listinfo/rsyslog
> >> > > http://www.rsyslog.com/professional-services/
> >> > > What's up with rsyslog? Follow https://twitter.com/rgerhards
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> >> > > if you DON'T LIKE THAT.
> >> _______________________________________________
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> >> https://lists.adiscon.net/mailman/listinfo/rsyslog
> >> http://www.rsyslog.com/professional-services/
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> >> of sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you 
> >> DON'T LIKE THAT.
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