[OSM-talk] Why isn't any XAPI server available ?

Sami Dalouche skoobi at free.fr
Fri Feb 18 20:22:00 GMT 2011


Something I wonder about :

does osmosis/xapi import the planet dump as-is, or does it do some 
pre-processing to get rid of the history ?
If osmosis is lossless, would it make sense to make a lossy version that 
gets rid of older versions ?

regards,
Sami Dalouche


On 11-02-18 02:29 PM, Graham Jones wrote:
> Are the hardware requirements really so modest?
> A few weeks ago I tried experimenting by importing just Europe and it 
> took a week (on my machine which has 2GB memory), so I gave up on the 
> idea of having my own whole planet database.
> Then I had major trouble with the database size growing, and never 
> really got the 'trimming extra nodes outside of the bounding box' 
> trick working - that seemed to take so long that I gave up on it. 
>  Maybe you need to do that after each import, rather than prune it 
> once a week....
>
> If people are managing to maintain their own database on modest 
> hardware, I would be interested to know what hardware and software 
> configuration they use, because I am thinking of investing in a 
> virtual server to do it, but want to go for minumum specification to 
> save on the cost.
>
> Graham.
>
> On 18 February 2011 18:27, 80n <80n80n at gmail.com 
> <mailto:80n80n at gmail.com>> wrote:
>
>     On Fri, Feb 18, 2011 at 5:47 PM, MP <singularita at gmail.com
>     <mailto:singularita at gmail.com>> wrote:
>
>             More XAPI servers running on good hardware is the only
>             realistic solution.
>
>
>         Well, there could perhaps be another solution, like running
>         your own XAPI server - the minutely diffs are usually less
>         than 100Kb, so the required bandwidth to download from
>         planet.openstreetmap.org <http://planet.openstreetmap.org>
>         would be less than 2 Kb/second in average.
>
>         But the question is - how large would be the planet database
>         on disk (how large would it get once you import the planet dump)
>
>         I guess the database would be in order of tens of gigabytes,
>         probably over 100 GB ...
>
>
>     About 350GB
>
>
>         And how much memory you need on the machine to run some
>         reasonable queries (if 4 GiB works for main XAPI server, would
>         it be usable on machine with only 1 GiB of memory?)
>
>
>     Yes
>
>
>         Martin
>
>
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>
> -- 
> Graham Jones
> Hartlepool, UK.
>
>
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