[OSM-talk] instant rendering of new tiles in mapnik layer

[Artem Pavlenko]

On 21 May 2007, at 01:06, Robert (Jamie) Munro wrote:

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> Jon Burgess wrote:
>> I've just made some changes to the Mapnik layer tile server to  
>> generate
>> missing tiles on-the-fly. In most cases you should not see the 404  
>> 'more
>> tiles coming soon' tile being returned.
>
> Fantastic! This seems to work really well for me. The tiles that are
> being rendered are obviously slower than the ones that are already
> rendered, but still perfectly usable.
>
>> This extra load may adversely effect the performance of tile so I  
>> have
>> placed some bounds on the maximum number of outstanding tiles. If  
>> this
>> limit is hit you will get the old 'more coming soon' tile again. This
>> might happen right now if you all rush at once to examine those  
>> zoom 18
>> tiles!
>>
>> The data used to render the tiles is still from the latest planet.osm
>> dump so please do not expect any data that you have uploaded since
>> Wednesday to appear until after the next planet dump.
>>
>> Re-rendering of existing tile is still done as a background  
>> process so
>> you may see stale data immediately after a new planet dump. I may  
>> extend
>> the live rendering to include these tiles too if the current setup  
>> works
>> well.
>
> Ideally you should serve an old tile if the server is busy, but  
> render a
> new one if  the outstanding tiles number is low (a lot less than what
> you use for the 'more coming soon' tile, so that new tiles take  
> priority
> over re-renders).
>
> You might want to do something like flush out all tiles that haven't
> been rendered for a month or something so that things don't get really
> old with the above system, and to stop the disc filling with level 18
> tiles of obscure places that one person visited once by mistake and no
> one will ever look at again :-)
>
> Having the whole world visible is a fantastic breakthrough (albeit a
> week out of date). Thanks very much Jon.
>
> Now all we need is a more frequent planet dump (or a more direct  
> way to
> get data into PostGIS)...
>
> Robert (Jamie) Munro

Works very well for me, too.  Thanks Jon!

Cheers,
Artem

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Artem Pavlenko
http://mapnik.org



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