[Tilesathome] Requests handed out multiple times

["Marc Schütz"]

> > I've noticed too that tiles are handed out to multiple clients.
> > I was rendering a complex tile and was checking the tile info page too
> and I saw 
> > it being uploaded at least 3 times before I was finished.
> > And it didn't take me hours.
> > 
> > How long does it take for the T at H server to decide the tile is not
> coming back 
> > and gives it away to another client?
> 
> As soon as a request is handed out to a client people can request the same
> tileset again. This is one reason why several tilesets can be rendered
> simultanously.

I'm sure this is not the case here. I think this is already going on for some time, as I can remember having seen an empty tileset list on my user page several times while my client was rendering.

> I am sure there are more reasons (including bugs) why it could
> happen.

Is the request handout and removal from the database done atomically? Could there be a race condition?

BTW, http://tah.openstreetmap.org/Request/show/uploads/ returns HTTP 500 right now, but this is probably unrelated.

Regards, Marc

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