[Talk-GB] OSM Mapper

David Earl david at frankieandshadow.com
Fri Sep 18 11:49:02 BST 2009


Well done, and congratulations! I saw the feed come through earlier on 
this morning and have been working through reviewing the changes in my area.

In my so far futile attempts to reload the namefinder index, I've found 
the same thing - the time to reload seems to be exponential with the 
size. I was hoping I'd be able to reload it and then go back to daily 
updates, but it's proving almost impossible to get beyond first base in 
the MTBF, so I'm probably going to have to rethink the strategy 
completely. While Postgres may possibly be faster, I suspect the 
pathological problem will still be there - I think in my case it is 
trying to build a join table to give a two-way reference between nodes 
and ways that's the issue.

David

On 18/09/2009 11:36, Peter Miller wrote:
> Just to say that we have just updated the data in OSM Mapper from the  
> 8th Sept to the 18th Sept. A huge apology for what I believe is the  
> longest interval between updates that we have ever had. There are a  
> couple of reasons for this.
> 
> Firstly, the import time is increasing dramatically. just over a year  
> ago the import took 10 hours, then it crept to 12 hours then to 33  
> hours and now to 45 hours due to the increasing size of the DB. I am  
> not clear if the DB is now 4 times bigger than it was a year ago or if  
> our import time increases faster than the increase in size of the DB.  
> What is does mean is that a failure for any reason adds a further 2  
> days to the import time.
> 
> Secondly, we have had a birth! A new shiny person arrived two week  
> early last weekend ago and Dad for obvious reasons stopped monitoring  
> the import and we didn't notice that it had failed until a couple of  
> days ago. We now have someone else watching the OSM import on a daily  
> basis while Dad is occupied!
> 
> Going forward we hope to achieve one update every 2 days with the data  
> arriving about 2 days after the daily diff until the DB gets even  
> bigger! We do also have work in progress to move to something much  
> more efficient and current but as with all things it is a matter of  
> juggling priorities.
> 
> 
> You can sign up to OSM Mapper for free here:
> http://www.itoworld.com/static/osmmapper
> 
> 
> 
> Regards,
> 
> 
> 
> Pete
> 
> 
> 
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