Mongrel users - Oct 2007 - cluster::restart doesn''t wait for stop before starting

Hi,

I''m calling restart from my Capistrano task. I have this in my
deploy.rb file:

# until mongrel_cluster updates to cap2...
namespace :deploy do
  task :start,    :roles => :app do start_mongrel_cluster end
  task :stop,     :roles => :app do stop_mongrel_cluster end
  task :restart,  :roles => :app do restart_mongrel_cluster end
end

(What''s the scoop on mongrel_cluster with Capistrano 2 by the way?)

The command that''s executed with a restart is:

sudo mongrel_rails cluster::restart -C /etc/mongrel_cluster/staging.yml

 ** [out :: 208.75.84.228] stopping port 8010
 ** [out :: 208.75.84.228] already started port 8010


At this point the server is not running -- I conclude that it has been 
stopped successfully. Now if I call on "start" it starts properly 
without an "already started" warning.

This happens intermittently. Sometimes it restarts fine. If I call 
stop/start manually, it works because I guess I''m leaving enough time 
in between for it to shut down.

Any thoughts on this?

capistrano 2.0.0
mongrel 1.0.1
mongrel_rails 1.0.2

--Andrew Vit

It would be good if it were redesigned to listen for the mongrel to finish
before starting it again, every time I stop our front end mongrels one or
two of them don''t stop quick enough (there are a lot of 1/2-1 sec
pages) and
i''m pressing up/enter/up/enter/up/enter to start them up again as fast
as
possible.
(anyway, what i meant to add was its not a Capistrano issue alone)

On 10/27/07, Andrew Vit <andrew at avit.ca> wrote:
>
> Hi,
>
> I''m calling restart from my Capistrano task. I have this in my
deploy.rbfile:
>
> # until mongrel_cluster updates to cap2...
> namespace :deploy do
>   task :start,    :roles => :app do start_mongrel_cluster end
>   task :stop,     :roles => :app do stop_mongrel_cluster end
>   task :restart,  :roles => :app do restart_mongrel_cluster end
> end
>
> (What''s the scoop on mongrel_cluster with Capistrano 2 by the
way?)
>
> The command that''s executed with a restart is:
>
> sudo mongrel_rails cluster::restart -C /etc/mongrel_cluster/staging.yml
>
> ** [out :: 208.75.84.228] stopping port 8010
> ** [out :: 208.75.84.228] already started port 8010
>
>
> At this point the server is not running -- I conclude that it has been
> stopped successfully. Now if I call on "start" it starts properly
> without an "already started" warning.
>
> This happens intermittently. Sometimes it restarts fine. If I call
> stop/start manually, it works because I guess I''m leaving enough
time
> in between for it to shut down.
>
> Any thoughts on this?
>
> capistrano 2.0.0
> mongrel 1.0.1
> mongrel_rails 1.0.2
>
> --Andrew Vit
>
>
> _______________________________________________
> Mongrel-users mailing list
> Mongrel-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-users
>
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We notice this a lot in our environment because some mongrels in the  
cluster are assigned to handle image magick tasks and can take a while  
to acknowledge the TERM signal.

 From my understanding mongrel_rails cluster::restart sends a TERM to  
each mongel, which causes it to wait for the currently processing  
request to finish, then closes the connections of the other requests  
outstanding. If this doesn''t happen straight away then you''ll
get the
already started message.

The solution to me would seam to give cluster::restart an optional  
delay parameter so those slow mongrels can catch up.

Cheers

Dave

On 28/10/2007, at 11:40 AM, Andrew Vit wrote:
> Hi,
>
> I''m calling restart from my Capistrano task. I have this in my  
> deploy.rb file:
>
> # until mongrel_cluster updates to cap2...
> namespace :deploy do
> task :start,    :roles => :app do start_mongrel_cluster end
> task :stop,     :roles => :app do stop_mongrel_cluster end
> task :restart,  :roles => :app do restart_mongrel_cluster end
> end
>
> (What''s the scoop on mongrel_cluster with Capistrano 2 by the
way?)
>
> The command that''s executed with a restart is:
>
> sudo mongrel_rails cluster::restart -C /etc/mongrel_cluster/ 
> staging.yml
>
> ** [out :: 208.75.84.228] stopping port 8010
> ** [out :: 208.75.84.228] already started port 8010
>
>
> At this point the server is not running -- I conclude that it has been
> stopped successfully. Now if I call on "start" it starts properly
> without an "already started" warning.
>
> This happens intermittently. Sometimes it restarts fine. If I call
> stop/start manually, it works because I guess I''m leaving enough
time
> in between for it to shut down.
>
> Any thoughts on this?
>
> capistrano 2.0.0
> mongrel 1.0.1
> mongrel_rails 1.0.2
>
> --Andrew Vit
>
>
> _______________________________________________
> Mongrel-users mailing list
> Mongrel-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-users