[Mongrel] [ANN] Another mongrel_cluster prerelease

Carl Lerche carl.lerche at gmail.com
Thu Apr 12 15:28:55 EDT 2007

Yes, I have the same problem. On high traffic apps, mongrel cluster's
restart will fail pretty consistently (for the reasons stated above).
A --wait option seems like a reasonable solution.


On 4/12/07, Matt Zukowski <mzukowski at urbacon.net> wrote:
> For me at least the issue isn't so much constant and complete
> availability... It's that the "restart" command in mongrel_cluster
> basically doesn't work. After stopping, it tires to start without
> waiting for the servers to shut down. Most of the time this fails, as
> the old servers are still shutting down.
> Instead I find myself doing a manual 'stop', then ps'ing repeatedly to
> see if all the servers have shut down, and then starting manually.
> Zed A. Shaw wrote:
> > On Thu, 12 Apr 2007 10:15:13 -0700
> > "Michael A. Schoen" <schoenm at earthlink.net> wrote:
> >
> >> Matt Zukowski wrote:
> >>> Just a suggestion, but maybe the stop command should wait until all the
> >>> servers are actually down before it exits. What Michael describes below
> >>> is a fairly frustrating aspect of using mongrel_cluster. The restart
> >>> process right now kind of sucks, and I suspect that making it behave
> >>> more gracefully would make a lot of people happy.
> >> And Mongrel itself does support a more graceful restart, mongrel_cluster
> >> just doesn't use it at the moment. Even given the constraint that a true
> >> restart won't re-read the cluster config, still seems worth being
> >> available as an option.
> >
> > I think I'm going to say, no, you don't get this in mongrel_cluster.
> > When we had it there were way too many problems because how Rails does
> > this kind of soft restart isn't very clear.  It's basically a bunch of
> > black magic ruby that reloads all the stuff like in debug mode.  That
> > also means that it doesn't work with modules and systems that are
> > outside of rails.  For example, you can't hook into this restart
> > process so that you can properly close connections to Jabber servers.
> >
> > This lead to people having weird problems like Mongrel not actually
> > restarting and memory leaks.  Of course, they don't blame Rails or the
> > plugin they're using, they blame Mongrel.  In order to keep the support
> > problems to a minimum, we just stop the server and restart.
> >
> > What's wrong with that for people?  Apparently you all need constant
> > and completely available up-time for your web applications.  Great.
> > You can't get this from Mongrel, or from Rails, you need to look
> > outside at your proxy server, network architecture, and other sources.
> >
> > However, you do have access to it.  Every time mongrel starts up it
> > tells you what posix signals cause what actions.  If you want a
> > graceful restart and you know it will work then you just hit your
> > mongrels with that signal.
> >
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