From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Confused classes
Date: Sat, 6 Feb 2010 18:01:19 -0800 [thread overview]
Message-ID: <20100207020118.GA14392@dcvr.yhbt.net> (raw)
In-Reply-To: <201002061406.04172.ibc@aliax.net>
Iñaki Baz Castillo <ibc@aliax.net> wrote:
> El Sábado, 6 de Febrero de 2010, Warren Konkel escribió:
> > Could it be that class attributes are somehow being co-mingled when
> > unicorn is starting up under high concurrency? Perhaps a mutex is
> > missing somewhere?
>
> IMHO all your Unicorn workers are sharing the same DB connection (the same
> ActiveRecord instances) so the problem arises.
>
> Take a look to the configuration here:
> http://unicorn.bogomips.org/examples/unicorn.conf.rb
> You can see there how the ActiveRecord is disconnected at the beggining and
> started for each worker later.
Yes, you have to reconnect any connected TCP sockets since they have no
defined atomicity semantics when they're shared across processes/threads.
Ruby Mutexes aren't useful at all here, they're only useful with threads
in the same process. If you need to protect TCP client sockets from
multiple processes, you'll need SysV/POSIX semaphores or file locks
(flock/fcntl), but you're really better off using multiple TCP client
sockets in the first place.
--
Eric Wong
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prev parent reply other threads:[~2010-02-07 2:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-06 12:33 Confused classes Warren Konkel
2010-02-06 13:06 ` Iñaki Baz Castillo
2010-02-07 2:01 ` Eric Wong [this message]
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