[OSM-dev] How to clean up Negative IDs

Eric Wolf ebwolf at gmail.com
Tue Aug 3 21:46:42 BST 2010


Just how slow is bulk_upload.py?

I am loading a 177MB .osm file into an empty database on a quad 3.6Ghz Xeon
with 6GB RAM and 700GB of RAID5. The machine is basically idle except for
this load.

It's already taken almost an hour.

-Eric

-=--=---=----=----=---=--=-=--=---=----=---=--=-=-
Eric B. Wolf                           720-334-7734





On Tue, Aug 3, 2010 at 12:48 PM, andrzej zaborowski <balrogg at gmail.com>wrote:

> On 3 August 2010 20:28, Eric Wolf <ebwolf at gmail.com> wrote:
> > This is in reference to the USGS OSMCP project - not the real OSM...
> > When we imported our chunk of data initially (not me - the guy
> responsible
> > is on walkabout in the Rockies), we followed the convention of using
> > negative IDs in the .OSM file. But osmosis was used to load the data into
> > the database and now all of our data has negative IDs. This seems to have
> a
> > really nasty effect on the API - every time something is edited, a new
> copy
> > is created with positive IDs and the old version with the negative IDs
> > persists.
> > I assume there is something in the API that says "negative IDs == BAD".
> I've
> > been trying to test that theory but keep hitting stumbling blocks.
> Postgres
> > doesn't seem to want to let me defer integrity constraints, so my efforts
> to
> > change a few IDs to positive values keeps failing. Maybe I've lost my SQL
> > chops (or maybe I just can't do that as the "openstreetmap" database
> user).
> > Am I barking up the right tree? Should I just go ahead and destroy the
> > database and repopulate it using bulk_upload.py instead of osmosis?
>
> If there's no way disable the postgres contraints (I'm sure there is..
> but I'm a sql noob), I'd filter your .osm file through sed removing
> the '-' in 'ref="-'  and 'id="-' and reimport with osmosis, or modify
> your conversion script.  Using bulk_upload.py and the API will take
> ages.
>
> Cheers
>
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