Re: Unsafe Pickle Saving

on Sun Oct 21 2007, skip-AT-pobox.com wrote:

>     David> The result was that, when I was doing server-side filtering,
>     David> cache pickles would be read while being written, and SpamBayes
>     David> wasn't prepared to deal with the corruption.
>
> David,
>
> Can you explain how the pickle would be read and written simultaneously?
> Are we talking multiple apps or the same app from multiple threads?
> (Haven't looked at your patch yet...)

I assume it's the same app from multiple processes.  I don't know how
my server hands messages off to procmail -- it could well be running
them in parallel.  And then there's my cron job that does training
once daily, which could happen at the same time as any message
arrives.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com