2010/11/15 Greg Lappen <g...@lapcominc.com> > Thanks for all the feedback everyone! > > It seems like there are a few different ways to scale WebObjects > horizontally, but nothing that is included in the WebObjects core. And > there is definitely a lack of documentation on this topic around the > interwebs, so I guess it's a DIY kind of project. >
Do a WOWODC session if you get your apps to scale properly :-) > Thanks all! > > Greg > > On Mon, Nov 15, 2010 at 2:30 PM, Andrew Lindesay <a...@lindesay.co.nz>wrote: > >> Hi Greg; >> >> >> #1 - Only one thread can be processing at once. I seem to recall that >>> this is a limit in EnterpriseObjects but it's been a while. >>> >> >> You are right that one EOF stack can only be used by one thread. You can >> load-up multiple EOObjectStoreCoordinators into a pool and use those within >> one virtual machine to create instances of EOEditingContext-s. I think >> there's some material in PW for this or you could roll your own. >> >> For bulk data processing such as a billing system, one approach is to use >> a "map/reduce" approach. Divvy up the work into little parcels and then >> distribute them to other virtual machines each with their own EOF stack. >> This spreads the load across available CPU and memory resources. >> >> >> With that being said, how can you horizontally scale your application >>> layer? If you setup more instances of your app, they each have their >>> own caches, which will be out of sync with each other. Is there a >>> commonly used framework for doing distributed cache management? And is >>> it possible to make your applications multithreaded so page requests can >>> be processed concurrently? >>> >> >> Yes you can "process concurrently" -- there's a setting for that or you >> can use; >> >> WOApplication.setAllowsConcurrentRequestHandling(..) >> >> For handling keeping caches consistent, you can use a "change >> notification" system. This will shift changes from one EOF stack into other >> EOF stacks. This works really well and there is an implementation in PW as >> well as other implementations available. >> >> cheers. >> >> -- >> Andrew Lindesay >> www.silvereye.co.nz >> > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/probert%40macti.ca > > This email sent to prob...@macti.ca >
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