missing outer polygon(s) when diff update deletes a multipolygon relation about osm2pgsql HOT 5 CLOSED

Yes, this is a long standing bug in the diff import code. It has been reported as https://trac.openstreetmap.org/ticket/4525
There also exists a patch to fix it, but so far it has never been committed, as the impact of it wasn't clear or if there is a better way.

However, as no one has done such an assessment or come up with a better way in the last 10 month, I will likely just go ahead and commit it soon and we will just have to live with the consequences to performance it entails.

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I doubt it will have a big consequences on performances. Deleting relations is not something that happens so much.

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Well, I have now committed the patch, which I believe should fix this.

If anyone does notice a significant drop in performance (or other issues), please report.

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On 08/29/2013 12:09 PM, cquest wrote:

We've deployed this patch on a test server (layers.openstreetmap.fr)
but my first tests show that it does not fix the issue... :(

Do you have an example of where it doesn't work? It did fix the examples
I was aware of and I included in the test suite.

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I posted my comment a bit too quickly... i was just too impatient. The patch seems ok, sorry.

I'm just wondering now how to recover the lost polygons...

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