[Mongrel] MongrelCluster - How can I make a request to a specific mongrel instance?

Ezra Zygmuntowicz ezmobius at gmail.com
Thu Aug 24 11:53:46 EDT 2006


On Aug 24, 2006, at 8:13 AM, Scott R Brittain wrote:

> In our app we've a number of singleton ruby classes that cache  
> static data in hashes, things like
> string values, system config params, etc).  In a webbrick  
> environment this works ok, but we find
> in production we have a problem because we have 4 caches, one for  
> each mongrel instance.
>
> This also isn't a BIG problem, but our cache.reload() methods are  
> kinda useless now, because
> we can't direct this call to a specific mongrel/rails instance.
>
> Any suggestions?  In the long term, we'll be redesigning the cache  
> to be shared, but we'd like to
> fix this now.
>
> Had considered writing a quicky "broadcaster" that would iterate  
> over our known mongrel ports
> and hit them directly.  But we're not sure if (a) that would work  
> and (b) the best way to read the
> current running ports.
>
> Thanks in advance.
>
> Brittain


Hey Scott-

	Well you can use pound to setup sticky sessions or session affinity  
but I don't reccomend that as its fragile. I would say your best  
option is to make a very simple drb server to run your singleton in  
and then all mongrels can talk to the one instance over drb.

-Ezra
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