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Re^2: Parsing a specific section of a log file

by Random_Walk (Prior)
on Mar 01, 2007 at 16:51 UTC ( #602719=note: print w/replies, xml ) Need Help??


in reply to Re: Parsing a specific section of a log file
in thread Parsing a specific section of a log file

I use POE::Wheel::FollowTail to parse, analyse and forward events concurrently from two very busy logfiles (each about 100M a day, average 10 significant lines per second, picked out of three or four times that many, peaks way above that). I have POE look at the file every five seconds and the CPU hit is negligable compared to other processes on the box. I guess it queues itself an alarm between checking the file as this particular POE is doing little else (throws an I'm alive event every minute just in case).

I like the fact the FollowTail handle the log file being rolled over, tells me about errors without choking and generaly just does the right thing. It saved a lot of thinking about all the corner cases (in my case these files are r/o NFS mounts from elswhere and occasionly mis-behave) and let me concentrate on the interesting bit.

Cheers,
R.

Pereant, qui ante nos nostra dixerunt!
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choroba's discovered two instances of a weird animal in the code at work: \@$var
[Eily]: hum, tied scalar, generates a new array when derefed ? :D
[Corion]: choroba: Ah, when doing a shallow copy, I prefer [ @$var ] - I think \@$var might return the same reference instead of a reference to a fresh copy
[Corion]: perl -wle "my $ar = [1,2,3]; my $br=\@$ar; print qq($ar / $br)" confirms this to me
[karlgoethebier]: "discovered" this to sum an array: perl -E 'say scalar map {1 .. $_} (1..3);'
[Corion]: karlgoethebier: Hahaha :)

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