CODEWITHSUNDEEP
mongodbreal-timerethinkdb
Afshin Mehrabani
Afshin Mehrabani

Reputation: 34929

MongoDB realtime query

I've heard about RethinkDB and since I'm developing a multi-player online game I think if MongoDB pushes the changes (let's say new rows) instead of pulling rows, it would be much faster for both server-side and client-side.

Is there any wrapper or techniques to make a realtime query to MongoDB or not?

Upvotes: 4

Views: 1259

Answers (1)

mnemosyn
mnemosyn

Reputation: 46291

You can leverage tailable cursors on capped collections. At the lowest level, that would require writing all changes to the capped collection first, then have them be applied by some kind of worker (an event sourcing pattern). That's a severe change of application architecture, so it's probably not what you want.

A more generic approach is to watch the oplog, a special capped collection that is used to synchronize master and secondary nodes and that contains all operations performed on documents, so no change in application architecture is required.

Still, this is somewhat more low-level than what RethinkDB exposes, in particular because you need to perform a diff. There are wrappers that can hide some of the complexity, but I haven't used them and I don't know what programming language you're using. Oplog monitoring is used, for example, by Meteor, which is pretty much built on publish/subscribe and hides most of the complexity, so it's generally possible, though it seems it's more complicated than with RethinkDB.

Upvotes: 2

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