On 28/10/2011, at 2:36 AM, George Reese wrote: > The complete lack of evolution of the OSAPI combined with the irrational > resistance to the EC2 API has struck a nerve with me. > > #1 Feature coverage in the OSAPI is atrocious. And I don't get the feeling > there's anyone seriously doing anything about it. Of course, you can always > say, "George, it's an Open Source project. If you don't like it, feel free to > fix it." Of course, I'm not worrying about all kinds of bizarre OpenStack > projects that have nothing to do with building a basic, functional cloud > platform either.
Great - do you have a list? > #3 Push scales a hell of a lot better than having tools polling a cloud > constantly. It doesn't matter whether it is polling the API, polling a feed, > or polling a message queue. Polling is one of the most unscalable things you > can do in any distributed systems scenario. That's a very absolute assertion to make, and doesn't reflect the experiences I've had. I've helped build polling-based APIs and pull-based systems inside of Yahoo! and Akamai that scale quite well. I've built polling-based systems where push-based message busses failed, miserably. In my experience, push-based systems bring a LOT of complexity and implementation overhead, and are especially problematic to run across administrative domains; there are certainly cases that require them, but they're not a silver bullet. > Calling it a feed doesn't magically solve the problem. Absolutely not. They're a tool to be used, just like any other. > Push notifications are the only mechanism for solving the scaling issue. You > push any changes to a message queue. Agents pick up the changes and send them > on to subscriber endpoints. Not that hard. Again, that's a big assertion to make. I'd rather evaluate the tools based upon the use case, rather than arguing by assertion. Thanks, -- Mark Nottingham http://www.mnot.net/ _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : [email protected] Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
