Nobody is asking to move all core services. We are talking about history, bookmarks and passwords, for now.
Andreas Mark Finkle wrote:
------------------------------------------------------------------------ I did some experiments with pouchdb inside Gecko, using passwords and bookmarks as my two main use cases. As Dale pointed out, if we use a shadow database and then replicate the shadow database, we also have to replicate from the current storage backends (password, bookmark places, history places) into the local couchdb/pouchdb (I will use couchdb as an abstraction anything that looks like a couchdb interface/api/db). I wrote a draft of that code for passwords and its not really trivial. Its probably roughly as complex as doing the same and using a custom replication using the couchdb wire protocol into a remote couchdb on the server.Using a custom replication using CouchDB wire protocol has a benefit of not needing to convert the entire application to use CouchDB as the backing datastore. Given that the effort could be "roughly as complex", I'd rather explore the custom replication and not trade lock-in to one datastore (SQLite) for another (CouchDB).An alternative to both would be to simply swap our current storage backends for couchdb, in particular because some of our current storage code is atrocious anyway (history is better, bookmarks are bad, password backend is horrific and totally synchronous). The main problem we are running into here is that the password manager for example is completely synchronous. The API is of the form x = searchLogin(needle). This can't be changed easily because there is layers and layers of APIs around this API all across the codebase that are also synchronous. Rewriting all of that to take a result callback would take at least a couple months. Its righteous work, but it takes time, and it doesn't really solve a performance problem because this code path is very rarely taken. The solution old sync took (make a synchronous call, spin the event loop while waiting, continue) is really terrible and we should not go down that path.Let's not underestimate the time required to move from SQLite to CouchDB for all core data in Firefox.
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