I would like to append a small line of log information
to a file on certain apache2 requests. For this
application, I am very concerned about speed, so i'm
looking for fast simple solutions.
I could stuff the information in the error log as per
http://perl.apache.org/docs/2.0/api/Apache/Log.html, and parse it out later off-line, but I'd prefer to
reserve the error log for errors.
I could stuff the information in the access log, and likewise pull out the data later off-line: how might I get data to the access_log?
The most natural place to append the information would
be a dedicated file. I've never written to a file
from mod_perl, and don't know the correct idiom
(flock? etc?) to do so.
I'd appreciate any pointers to recipes, modules, etc. to show me the correct (fast, reliable) way to append to a file under MP2.
You may want to spend some time with the mp2 docs first. http://perl.apache.org/docs/2.0/user/
Your particular question is answered at these locations: http://perl.apache.org/docs/2.0/user/handlers/http.html#PerlLogHandler http://perl.apache.org/docs/2.0/user/handlers/server.html#Startup_Phases_Demonstration_Module
As for flocking, I prefer to do that, even though there are claims that short writes are atomic. It's probably not the same on all io implementations.
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