fair load balancing?

[Ask Bjørn Hansen]

On Jun 20, 2008, at 10:26, Moses Hohman wrote:

> Finally, what would Perlbal do if all mongrel processes were busy  
> and did not respond to the verify_backend requests? Would Perlbal  
> itself then queue up those requests?

Yes, it's really good about that.

I have one client who's running his application on just one server.   
There we still use Perlbal in part for buffering, but also because it  
makes it safe and easy to restart the application server (eh, apache)  
as Perlbal will help the users wait for the few seconds until the  
service comes back.

Another related trick I use there is to have a small script that talks  
to the perlbal management port and makes the service use a different  
pool when we need to do database maintenance or such that takes down  
the site (again, there's only one server so we can't do the usual "use  
the other master" tricks for schema changes).



  - ask

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