[Tilesathome] Status report

[spaetz]

- The blank tile table is still happily being shrunk in size, we are down from about 130mio entries to 45mio entries without loss of information. This will take about 2 more days.

Rate limiting:
-Somebody was requesting things like crazy (LosHawlos, yes that is you :-), who are you?) and as we have tons of renderer clients now, there were 2,500 active requests out at the renderers at the same time. This brought the API server down to a crunch which basically stopped everything. This is clearly not viable.

I spoke with TomH, only about 3 concurrent connections can be made to the server at the same time, so some rate limiting needs to be done.

I have implemented that now. We will never hand out more than 500 active requests. I pulled that value out of the hat, as 2.5k was definitly over the top for the API server, especially as clients blindly seem to retry every 60 seconds, occupying the server even more. We might still want to teak that value a bit.

No requests will actually get lost: we just build up the pending queue now and work through that as we have resources.

Happy rendering
spaetz

P.S. A huge queue has built up which we will work on now, hopefully things will run again smoothly a few hours from now on.
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