IRC log of #zope for Tuesday, 2012-11-13

« Monday, 2012-11-12 Index Wednesday, 2012-11-14 »
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jakkeHi guys, I'm trying to add extra loggers to my zope app through the buildout.cfg file10:39
jakkePlenty of places that describe how to tune the event-log and access-log10:39
jakkebut not how to add new loggers, any suggestions where to look? I don't want to spoil my event log with xml, but I do want logging of my incoming xml10:39
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jakkethat's why I defined this extra logger in my code10:40
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fredvdI'm running zope under supervisord and noticed this week that redirected stdout output is buffered and only available after a long delay in the supervisor captured log file. See also https://github.com/Supervisor/supervisor/issues/13 .  I have no clue if python -u would also mess up other stuff (streamd unbufffered as suggested in the ticket. Is this something I could change in Zope config?11:51
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mgedminfredvd, AFAIU it's a kernel limitation13:27
mgedminall pipes are buffered13:27
mgedminif you want unbuffered logging, log to a file, or convince supervisor to use pseudottys13:28
mgedmin(I mention that second option as a theoretical possibility -- no clue if supervisor supports that, or even if that would be a good idea)13:28
fredvdmgedmin: ok, thanks for the info!13:29
mgedminhm, this is a good argument against one of the factors of http://www.12factor.net/13:29
mgedminmaybe heroku does use ptys?13:29
fredvdmgedmin: you mean the "It should not attempt to write to or manage logfiles. Instead, each running process writes its event stream, unbuffered, to stdout. "13:30
mgedminyes13:30
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fredvdif I look at #13 from supervisord: maybe Zope should flush stdout after every write, but that is probably a resource hog.13:30
fredvdThe reason I'm running into all of this is because I wanted to do a kill -USR1 to get a backtrace of running threads from a zope server.13:31
mgedminhttp://unix.stackexchange.com/questions/25372/turn-off-buffering-in-pipe13:31
mgedminflushing stdout is not sufficient -- the 4KB kernel pipe buffer is always there13:31
mgedminhm... maybe I'm wrong?13:32
fredvdOnly to find out that in production it doesn't work. so the signal handler could be modified to do the flush. Or push always 4Kb out. :-013:32
mgedminpython -c 'import time, sys; print "foo"; sys.stdout.flush(); time.sleep(1); print "bar"'|cat13:33
mgedminok, experiment shows I'm Wrong Wrong Wrong13:33
mgedminif you flush, the data does not get stuck in the pipe buffer13:33
fredvdOk, so patching zope's usr1 handler to flush after dumping stack traces would suffice then.13:34
mgedminyep13:34
mgedminshould13:34
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mgedmintell me how it goes please :)13:34
fredvdI'll see if I can forward it to a colleague, I normally don't touch Zope on the code level. At least I now know where the root cause is.13:36
mgedminapparently you can fix it without touching Zope code13:36
fredvdby using the unbuffer?13:36
mgedminif you run it wrapped with expect_unbuffer13:36
mgedminyes13:36
fredvdYes, but it's the same as the python -u option: I'd have no clue of other side-effects.13:37
mgedmin(that would be the "make supervisor use pseudoterminals" options, implemented through an external tool)13:37
fredvdI only want stdout unbuffered, not anything else inside the process that uses buffers.13:37
mgedminexpect_unbuffer only affects stdout (and stderr)13:38
mgedminat least, that's what I'd expect13:38
fredvdWell that's something I can test. ;-13:41
fredvd;-)13:41
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koshhail freaks!18:46
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betabugsm: hey there!21:57
betabugsm: sorry for the delay, I'm running for a deadline here a bit, will send that email in a few days21:57
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smhey betabug, no problem22:06
smbusy here too22:06
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