Fair Proxy Balancer
lists at ruby-forum.com
Mon May 5 20:21:49 MSD 2008
Grzegorz Nosek wrote:
> Please give the module a try and report any issues you might find.
This module works great, thanks for releasing it. While validating its
behavior, I noticed a few gotchas that I wasn't expecting, but I'm not
sure if there is anything upstream_fair can do about it:
1) If a client performs a request which is long running, and then gets
fed up with waiting and closes the connection, upstream_fair marks the
backend process as idle even though it is still servicing the request -
I guess it is monitoring the front side of the connection rather than
the back side...?
2) If I have a long running request active on a mongrel, and nginx times
it out (proxy_read_timeout defaults to 60s), the request is still
running on the mongrel, but upstream_fair marks it as idle.
These gotchas can both cause upstream_fair to schedule requests on
mongrels that are not actually idle when there are other idle ones
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