[reportlab-users] Intermittent failure to find font, followed by IOError

[Stevens, Ian]

I've been reading the follow-ups to this, so I'll add as much
information as I can. Unfortunately, I'm not administering the
production machine.

- We're using Reportlab 2.1, both Debian and Ubuntu distributions, and
Django is run under mod_python.
- We've seen the problem under both prefork and threaded Apache configs,
although it appears to happen more often under prefork on production
with unlimited MaxRequestsPerChild.

As for adding logging, I can probably get someone to make changes to a
development server to exhibit the same errors. 

Ian.


> -----Original Message-----

> From: reportlab-users-bounces at reportlab.com 

> [mailto:reportlab-users-bounces at reportlab.com] On Behalf Of 

> Andy Robinson

> Sent: January 19, 2009 5:37 PM

> To: Support list for users of Reportlab software

> Subject: Re: [reportlab-users] Intermittent failure to find 

> font,followed by IOError

> 

> 2009/1/19 Stevens, Ian <IStevens at globeandmail.com>:

> > This error is intermittent, which is bothersome, and always occurs 

> > from the same line, executed within a PageTemplate's 

> onPage() method. 

> > Here's a stacktrace of the error:

> 

> I have no ideas and no experience of anything similar - and 

> we've been hosting serious 24x7 apps with a very similar 

> architecture to yours for 2 years with no similar

> exceptions.   Some more data would help.

> - which ReportLab version?

> - is it some kind of Linux?  The OS may affect some paths 

> through the code.

> - how are you running Django?  FastCGI, mod_python?  The font 

> cache is once-per-process and does not get explicitly 

> unloaded, so I wonder if the intermittent nature means it is 

> something happening when the web server restarts Python processes.

> - would you be able to promote live a metered version which 

> adds some logging statements?  Alternatively, can you force 

> similar issues in a test environment which you could then debug?

> 

> We do have some code for resetting the font cache but I need 

> to speak to a colleague in the (UK) morning to see what could 

> trigger it.

> 

> Best Regards,

> 

> 

> --

> Andy Robinson

> CEO/Chief Architect

> ReportLab Europe Ltd.

> Media House, 3 Palmerston Road, Wimbledon, London SW19 1PG, 

> UK Tel +44-20-8545-1570 

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