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On 14-08-19 12:46 PM, Gustavo Niemeyer wrote: > On Tue, Aug 19, 2014 at 1:10 PM, Aaron Bentley > <aaron.bent...@canonical.com> wrote: >> True. At that point, the pattern is not a win, but it's not much >> of a loss. Changing the web site relation is extremely uncommon, >> but operations which do require server restarts are quite common. >> So making an exception for the web site relation can be seen as >> a micro-optimization. > > Restarting a process and killing all on-going activity is a big > deal more often than not, for realistic services. Sure, if we *were* to optimize this, we'd want to restart only on certain kinds of changes. But I'd argue that it's better to optimize that in the application domain than based on hook names. For example, changing the cron interval does not require restarting the web server, but changing the http port does. Both use the same hook, config-changed. Instead of restarting the web server unconditionally, we could restart it when the contents of its config file change. That would avoid a restart when cron interval changes, and also when webserver-relation-changed fires. So I think it's a bigger win to focus on the application domain and ignore the hook names. > The point I was trying to convey is not that you can merge or > ignore certain events. The system was designed so that this was > possible in the first place. The point is rather that the existing > event system is convenient and people rely on it, so I don't buy > that a "something-changed" hook is what most people want at this > point. Fair enough. More evidence would be needed to determine whether I'm an outlier. Aaron -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJT84RTAAoJEK84cMOcf+9hmXEIAIc74ywBWOMybk6tVZh0sT/r 0GBt/AhDVRfzAt75rZGzuwlQLvu3tyAwY6yu0ROAdnW+dmJf5yGwJUAIDR3V0kcu kO866sXDmTysPs8vmiku1xFhFnwbxaJEJWG67zcUOacsl8fHaxMDH0ufm8YoOGgR fs6VtLp283wm1rYmeXwZ8FkZ7QRQZYwFZ9gNpXCjKHdSbW/yaT4o1HC7+MgeG3Cc mwPLWl2qQGHXxB6Jc2Bb+ebBw8WTSRNvpS4UmrMSzbbdqvlaytuJuRP6ansYTVYi X5I+CBWDbbImZBfEADCkQPYk1jX1GlinoQuInbnGrftViyQ/KTEXzzAEIJcRIGE= =bqp0 -----END PGP SIGNATURE----- -- Juju-dev mailing list Juju-dev@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/juju-dev
