[OSM-dev] Deleting TIGER node tags
gravitystorm at gmail.com
Tue Jul 21 18:48:16 BST 2009
On Tue, Jul 21, 2009 at 3:38 PM, Frederik Ramm<frederik at remote.org> wrote:
> Andy Allan wrote:
>> Tiger node tags make up 85.43% of all node tags and take up:
> I just did a little test, prepared an .osc document that removed the node
> tags from about 1000 nodes:
> It came out at roughly 10 node changes per second. I count 177m nodes with
> TIGER tags, which means that the whole process would take about 200 days on
> one API thread. It might be slightly faster if you upload larger or smaller
> chunks - would have to do some experimenting to find the sweet spot. Time
> could also be saved by running it one the LAN (on dev), but again probably
> not a lot.
Ah, good stuff. I was assuming the best way to do it was a script on
dev doing 50,000 nodes at a time (i.e. max diff upload) when it came
to hitting the sweet-spot, but I'm interested in your experiments.
Like you, I'm a bit concerned about the side effects of creating x
billion changesets, but for replication, verification etc it's nice to
behave nicely (i.e. through the API). But that just gives everyone an
added incentive to stop other people doing ill-constructive bulk
imports in the first place! The sooner we can clear this from TIGER
the fewer people will use it as an example to aim for.
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