Karl Newman wrote: > Heh, I was thinking along those lines, too, but I thought I'd wait > until your format stabilizes. It would be quite handy to have a > random-access data source for Osmosis without requiring a database > installation. I'm not sure if you realise this but there already is one of those. I can't reach the wiki at the moment but the tasks in question are: --write-customdb --read-customdb
I forget the details of the on-disk format but it's built around the osmosis store classes so uses osmosis specific object serialisation. The --read-customdb task doesn't actually stream data to downstream tasks, it provides the data in the form of a "dataset" object. This can be consumed by tasks such as --dataset-dump which will stream from the dataset, but it can also be consumed by any task wishing to access data randomly. Performance isn't great for large datasets which is why I created the pgsql-simple schema. I've never been able to get an on-disk format to scale nearly as well as a real database. I also wrote a set of tasks based on one the Berkeley DB Java Edition but deleted it because performance was even worse. Brett _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
