[Talk-GB] os.openstreetmap.org down?

Tom Hughes tom at compton.nu
Wed Feb 2 15:50:49 GMT 2011

On 02/02/11 15:31, Chris Moss wrote:

> Is this what you're referring to, or something else? What is time limit
> on it? 1 hour, 24 hours, what?

It's essentially a rate limit - it allows you to download data
continuously at a certain rate, but with an ability to burst for a
period of time.

Basically it's a form of "leaky bucket" algorithm, so it's like a bucket
of a given size with a hole in the bottom. When you download data you
are filling the bucket and data drains out the bottom at a fixed rate
regardless of the actual rate at you download.

If you carry on downloading faster than the data can drain from the
bucket it will eventually overflow and at that point it will stop you
fetching any more but the bucket will carry on draining and as it does
there will start to be some space in the bucket that will allow you to
download some more.

So if you hit it and you then don't download anything for a while it
will automatically back off.


Tom Hughes (tom at compton.nu)

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