[Cluster-devel] logging: final call on configuration, output and implementation

[Steven Dake <sdake@redhat.com>]

On Tue, 2008-11-11 at 06:54 +0100, Fabio M. Di Nitto wrote:
> On Mon, 2008-11-10 at 22:47 -0700, Steven Dake wrote:
> > On Tue, 2008-11-11 at 05:55 +0100, Fabio M. Di Nitto wrote:
> > > On Mon, 2008-11-10 at 17:46 -0700, Steven Dake wrote:
> > > > I disagree with a global debug keyword. 
> > > >  At one time I thought it was a
> > > > good idea but that time has long since passed.  The idea of turning
> > > > debug to on and then having all debug output go to syslog is frightening
> > > > and will result in lost messages.  While it appears this proposal
> > > > includes the selectable log output filtering per output medium as was
> > > > discussed already, it is unclear how the debug keyword affects this.  It
> > > > would simply make sense to change the file's log priority or the
> > > > syslog's log priority if that is the behavior desired and then no need
> > > > for any extra keyword.
> > > 
> > > You have these two situations:
> > > 
> > > print_log(LOG_DEBUG, "doing this and that....\n");
> > > 
> > > if (debug) { /*
> > >  gather_some_data_that_is_very_expensive_operation_to_do_all_the_time();
> > >  print_log(LOG_DEBUG, "print those extra data\n");
> > > }
> > > 
> > > as it is now, it would basically be an alias to set logpriority to DEBUG
> > > but enables people to execute debugging code conditionally and as I
> > > wrote it is an easy keyword to remember compared to
> > > syslog_priority/logpriority.
> > > 
> > > Fabio
> > > 
> > 
> > The second situation doesn't exist in any code I have written and never
> > would.
> 
> Clearly you haven't read what I wrote in the debugging note.
> 

I read it but don't agree you can have a discussion about logging and
flight recording without discussing how debugging fits into the log
system.


> > Turning debug on for all of the entire stack to be output to syslog is
> > not satisfactory because messages would be lost in overload conditions.
> > Logging to file is only a slight bit better solution but if you really
> > must have debug output in a persistent store that doesn't occur as a
> > result of a failure, logging to file is the only suitable answer.
> 
> Please point me to where I wrote that it should go to syslog as I only
> mentioned logfile_priority so far.
> 

If syslog is configured it will go to syslog by default in your scheme.

Regards
-steve

> Fabio
>