[Tilesathome] Rendered tiles vanishing

[David Earl]

On 23/07/2007 22:17, Dirk-Lüder Kreie wrote:
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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.


No, I mean I saw them go past, but that they no longer show up because 
of the 30 limit.


> 
>> 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.

16 out of 18 failures over six days is rather extreme though, don't you 
think? 4 of my 6 tiles are not dense at all; the other two are not extreme.

> 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.

Yes, I know. But after several days, there must either be a problem with 
the queue or it never made it into the queue.

I shall try again now and watch what happens to the extent I am able.

David