[Tilesathome] Processing delays

[Robert (Jamie) Munro]

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Milenko wrote:
> What's the cause of the ever-increasing processing delay on the t at h
> <mailto:t at h> server?
>  
> As seen here:
>  
> http://munin.openstreetmap.org/openstreetmap/dev.openstreetmap-tah_delay.html
>  
> Seems to have started when we took the break over the weekend that the
> new API was implemented.

Clients seem to still be taking hundreds of tiles from the queue and
never processing them. We really must make sure that taking a request
from the queue is an authenticated procedure, and people aren't allowed
to take more than a certain number of requests until they have finished
the ones they already have. I'd suggest starting with about 3 active
requests allowed at any one time, but if we can make a system that lets
clients tell the server when they had a rendering error, one at a time
should be fine.

People who run multiple clients should be able to request higher limits
(number of clients they run + a few spare for when rendering errors mean
they can't complete them).

Robert (Jamie) Munro
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