[Mongrel] mongrel, monit, and the many, many messages

[Erik Hetzner]

At Wed, 9 Jan 2008 01:58:58 +0100,
Greg Willits <lists at ruby-forum.com> wrote:
> 
> Monit 4.9, Mongrel 1.0.1, Rails 1.2.6, Mac OS X 10.4.11 (PPC)
> 
> I don't know whether this is a mongrel issue or a monit issue.
> 
> I'm trying to poke my way around a system set up by someone else. I have
> no more experience w/ mongrel that local Rails dev at this point, and a
> conceptual understanding of how monit is working. I have the Deploying
> Rails beta book, and I'm muddling my way thru mongrel and monit docs,
> but I think some hints as to direction would be useful.
>
> […]

I have seen a similar situation here. What happened was (more or less,
this is from memory) a mongrel instance would be locked up on an HTTP
response that would take a long time to complete. Because requests
would just queue up behind this one, monit would fail to get a
response in a reasonable time, would assume that the process was
non-responsive and try to restart it gracefully (using mongrel_rails
stop). Mongrel would take a long time to shut down because it was
still processing that long running response, so we would get a message
that monit couldn't shut it down and it would fail to start (or
something like that). Finally the long running rails process would
complete, mongrel would restart, and monit would let us know that the
process was back up.

The solution was to make sure that responses come back in a reasonable
amount of time.

best,
Erik Hetzner
;; Erik Hetzner, California Digital Library
;; gnupg key id: 1024D/01DB07E3
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