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All the Perl that's Practical to Extract and Report

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  • Something like this: my %warnings; $SIG{WARN} = sub { print STDERR $_[0] if not $warnings{$_[0]}; $warnings{$_[0]} = 1}; Gabor
    • Only works per-process.

      Most webservers are multiple processes with a limited lifetime (they often get killed after a fixed number of requests).

      Then there's the issue that most large sites have a server farm too...

      • Yes, it only works per-process and per-server, but in my experience (with 80+ servers running many mod_perl processes) it is a very simple and effective way to eliminating the kinds of web-service log-storms you described. It changes an unmanageable flood into a very manageable stream. Highly recommended.
        • Sorry, didn't mean to imply that it doesn't mitigate the problem, it does but it can only mitigate it.

          Whether that turns the situation into a manageable one or not would depend on circumstance. :)