mongrel unicorn - Oct 2012 - Handling timeouts?

Hi Guys,

Thanks for Unicorn, it makes my world rock. You guy have done a wonderful job
and also huge thanks to the predecessors too.

The default timeout on my Rails app is 30 seconds. The app works fine most of
the time but there are some parts of the app which are slow and occasionally
totter over the 30 sec response time and timeout. Is there a clean way for me to
hook into timeouts and notify myself when timeouts occur? Something like a
chance to email myself or send an airbrake notification?

Cheers,
Aditya

I just handle it by having NRPE grep through the Nginx error log;
that''s where you''ll see the timeout come in.

Example timeout:
2012/10/22 19:52:10 [error] 2071#0: *7269 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client: 70.127.166.167, server: www.domain.com, request: "GET
/follow_outlink?url=http%3A%2F%2Fblogs.orlandosentinel.com%2Fnews_politics%2F2012%2F10%2Frace-for-hd-49-gets-nastier.html&name=Sentinel%3A%20Race%20for%20HD%2049%20gets%20nastier
HTTP/1.1", upstream:
"http://unix:/etc/unicorn/domain.sock:/follow_outlink?url=http%3A%2F%2Fblogs.orlandosentinel.com%2Fnews_politics%2F2012%2F10%2Frace-for-hd-49-gets-nastier.html&name=Sentinel%3A%20Race%20for%20HD%2049%20gets%20nastier",
host: "www.domain.com", referrer: "http://www.domain.com/"

On 10/24/12, Aditya Sanghi <aditya.sanghi at risingsuntech.net>
wrote:
> Hi Guys,
>
> Thanks for Unicorn, it makes my world rock. You guy have done a wonderful
> job and also huge thanks to the predecessors too.
>
> The default timeout on my Rails app is 30 seconds. The app works fine most
> of the time but there are some parts of the app which are slow and
> occasionally totter over the 30 sec response time and timeout. Is there a
> clean way for me to hook into timeouts and notify myself when timeouts
> occur? Something like a chance to email myself or send an airbrake
> notification?
>
> Cheers,
> Aditya
> _______________________________________________
> Unicorn mailing list - mongrel-unicorn at rubyforge.org
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>

Hi Aditya
> The default timeout on my Rails app is 30 seconds. The app works fine 
> most of the time but there are some parts of the app which are slow 
> and occasionally totter over the 30 sec response time and timeout. Is 
> there a clean way for me to hook into timeouts and notify myself when 
> timeouts occur? Something like a chance to email myself or send an 
> airbrake notification?
In your unicorn config.rb file, this example would email a snapshot of 
top output when a worker times out:

before_fork do |server, worker|
   `tail -n 5 "#{log_path}/unicorn.log"`.split("\n").each do
|line|
     next unless line =~ /SIGKILL.*worker=(\d+)$/
     worker_nr = $1
     next unless worker_nr = worker.nr
     `top -n1 -b | mail -s "#{line}" sysadmin at example.com`
     break
   end

   # ?

end


Cheers,
Lawrence