Does Meteor Scale?

What would the performance of this be since the oplog stuff is mongo specific?

Obviously I can only speak for myself, but, in my opinion MongoDB is broken at a deep fundamental design level because the clever technological metaphor it's built upon (mmap is cache, we can overwrite in RAM and let the OS handle writes!) is just mistaken. All its other problems - trashing data, hogging resources, excessive locking, poor performance - are derived from that fundamental error, and all the fixes consist of beating a gradual retreat from it, a process rather like incrementally evolving a brick into a F1 race car. One has to ask, wouldn't it be better to start off without the brick? And rethinkdb is basically what MongoDB is, from a user's perspective, but it never had the brick.

It's a major indicator of poor system design.

EDIT: To be clear, I'm not necessarily knocking MongoDB—people who know more about it than I would do a better job of evaluating that. But realistically a swappable DB backend isn't that difficult, and if it is, they should seriously reconsider how they are using the database.

Thanks for that link. I very much agree. Meteor is going to be massive.

Yep, as Arunoda says I'm actively working on it right now, currently hoping for an initial release this month.

I really appreciate the work Arunoda has done on smart collections; my implementation and his package have both learned from each other. That said, there are a number of subtle race conditions involved in synchronizing queries between the oplog and the main database, and working out all the little details as carefully as possible has taken time!

It's a very useful feature, which can feed a cache layer, act as a kind of trigger mechanism or give you a (very limited) kind of transaction.

That's what exactly happened and @jjamz was helping me on the editing.

(anyway, I really welcome the english errors you raised, but I've done a lot of articles with my bad english. I hope most of Meteor user's got something out from them. That's the the point I think we should consider)

You ought to model your law after Godwin's in order to make it more true.