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                               Notes on logging

This is interesting: Facebook wrote their own logging system [1] instead of
using syslog. Their system only has two pieces of informtion—a catagory and
the message. No facilities, no priorities or levels. I think in Facebook's
case, they log everything so there's no need for individual priorities or
levels [2] (the argument here is: you're going to log everything eventually
anyway, so simplify the process).

Another note: when your configuration file is too complex [3] (or in other
words—an ad-hoc declarative language [4]) perhaps it's time to give up and
just use a scripting language for configuration (I skipped straight to using
a scripting language for configuration/logic).

[1] http://www.facebook.com/note.php?note_id=32008268919
[2] http://highscalability.com/log-everything-all-time
[3] http://blog.gerhards.net/2009/12/rsyslog-feature-schedule.html
[4] http://en.wikipedia.org/wiki/Declarative_programming

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