Anybody interested in testing patch to allow weighted nodes?

[Brad Fitzpatrick]

I don't think this would do what you think it would.

This would just be for allocating new connections (which is kinda
boring, and happens relatively rarely, and still only one
per-node-in-flight), not for how requests are actually assigned to
backends.


On Wed, 16 May 2007, Brett G. Durrett wrote:

>
> I have attached a patch to 1.57 that will allow weighting of nodes
> specified in a nodefile.  This might be handy if your servers have a
> wide  range of performance and you want to direct less traffic to less
> powerful servers.
>
> I am putting this out in case anybody has use for it and is willing to
> test it  :)
>
> Some notes:
>
> - It only works using nodefiles, not the config file node definitions or
> the configuration interface "add" or "remove" commands.
> - I am running about 5% of our traffic through my production test
> server... it appears to be working well but I would not feel comfortable
> asking others to try it in production.  I have done very little
> testing... I am not sure about the behavior in failure cases, especially
> in regards to failing-out bad nodes.
>
> - To weight a node, add whitespace and weight:<int> to the nodefile...
> for example:
>
> 10.10.10.78         weight:1
> 10.10.10.79         weight:1
> 10.10.10.124        weight:5
> 10.10.10.125        weight:5
>
> - If you do not specify a weight for any node the weighting code is
> ignored.
> - If you specify a weight for some (but not all) nodes, it will assume a
> weight of "1" for nodes that did not have a weight.
> - If weights are assigned, the "show pool <pool>" command will add the
> weights of all nodes to the output... if you did not use weighting, the
> standard output will be displayed.  For example:
>
> show pool virtual_web
> 10.10.10.78:80 765 weight:1
> 10.10.10.79:80 770 weight:1
> 10.10.10.124:80 4007 weight:5
> 10.10.10.125:80 3921 weight:5
>
> Again, this was a quick hack and I am providing this for testing... if
> your Perlbal is controlling a nuclear reactor, please don't try this.
>
> Thanks in advance for any testing / feedback you can provide,
>
> B-
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