[Tilesathome] Rendered tiles vanishing

[Dirk-Lüder Kreie]

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David Earl schrieb:
> Last week (Friday?) I did tile requests via informationfreeway on tiles
>    2046,1348
>    2046,1349(*)
>    2047,1348
>    2047,1349
>    2048,1348
>    2048,1349(*)
> 
> These never appeared on the map.
> 
> At some point over the weekend I requested them again. Still nothing.
> 
> After some substantial work on the area today, I put the same requests 
> again and watched the queue while they went through. They've now all 
> dropped off the bottom having supposedly been rendered, but only two of 
> them have appeared on the map (both are today's data, not the ones from 
> last week).

Dropped off the bottom where?
The page only shows 30 requests, so that's no indicator of a Tile being
rendered or not.

> How can I find out where the other four have gone, and why did the 
> earlier ones get lost altogether, all 6 x 2 tiles?

It is entirely possible that they take large amounts of RAM to render
and some clients will silently abort rendering. When a renderjob was
automatically re-entered into the queue by the server this was less visible.

Also when a older Renderer takes the job, but the OSM API is down it
will also silently abort the rendering.

Since r3635 it will try to re-request the tile if it fails somehow, but
not all cases are covered, so it's still possible a tilejob simply gets
lost. and when the API is down or slow that possibility gets more and
more likely.

Secondly, even if rendered there is an upload queue with quite a delay
so a Tileset can sit around for quite some time until finally uploaded.

- --

Dirk-Lüder "Deelkar" Kreie
Bremen - 53.0952°N 8.8652°E

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