[OSM-dev] Effort in the US wasted until TIGER import is complete?

Don Smith dcsmith at gmail.com
Wed Mar 28 03:35:24 BST 2007

Is there a test machine setup?
I'm still looking at the code. For simplicity's sake, I'd like to  
remove the ability to daemonize the code, and just run it from the  
command line as a regular process, with a high priority. If the idea  
is to do this on a testing db instead of the main db, and then import  
a dump of the db then I believe this makes sense. Another thing,  
someone was talking about setting up a copy of osm to import into.  
Instead I'd like to suggest that this data is just loaded into a  
blank template until everything works, then worry about merging the  
us data, either through using something like a temp tag to  
differentiate it and merging manually, or by doing something  
programatic after the fact. Whatever the user contributions are I  
would assume they're much smaller, although probably more accurate  
than tiger data.

Don Smith
On Mar 23, 2007, at 1:29 AM, Nathan Rover wrote:

> I'm thinking we need to set up a server with a mirror of the current
> database, then just run a few counties then eventually a large batch
> (one state at a time?). Then we can conduct some rigorous testing  
> and if
> the data looks good and we won't cause too much of problem on the
> production server, we could then ship the data across the pond (ether
> over the net or fedex some DVDs). Then one night perhaps an admin  
> could
> import the data. I've never been a big fan of messing with production
> servers, and it seems to costly both in time and bandwidth to try and
> run exports from TIGER data on a box in central Missouri, to the  
> UK, at
> one or three second intervals. especially when this will requirer lots
> of testing to make it work correctly.
> I have the hardware for the mirror, and I'm working on getting the  
> data. If this is a direction everyone agrees with then the next  
> thing I
> need is a little guidance on how to set up a server that will be a  
> good
> software mirror to the production one. The closer the software setup
> matches the production machine (especially the database system and the
> APIs ) the better our testing can be and the less likely there will  
> be a
> problem down the road when we try and integrate the data onto one box.
> Can someone send me a copy of the ruby code?
> Nathan Rover
> Don Smith wrote:
>> No, I'm currently not familliar with the data model so I should look
>> into that.
>> As for a 1 sec/insert cycle, if we don't do it on the primary db, it
>> makes no immediate sense, and I'd be interested in  timings without
>> it. I have no idea how many inserts are going on but, I would guess
>> from a ballpark on the size of tiger that you'd be right.
>> Again I'll look at the ruby code tonight, and if someone has a schema
>> for osm that'd be nice. If whoever did the original script could
>> outline their thinking that would be helpful as well.
>> I am subscribed to the dev list.
>> On Mar 23, 2007, at 12:06 AM, Thomas Lunde wrote:
>>> On 3/22/07, Don Smith <dcsmith at gmail.com> wrote:
>>>> Thomas,
>>>> do you have a machine setup? I'll look at the code tonight, but you
>>>> seem to have a better grasp of the operations going on. Any  
>>>> ideas in
>>>> what specifically needs to be done?
>>>> Right now, the two tasks appear to be aggregation of related  
>>>> segments
>>>> into ways (?) and the 1 sec insert cycle. I would suggest  
>>>> instead, if
>>>> possible that we load the data into mysql, and then when it's  
>>>> ready,
>>>> batch import the sql into the master db(does this make sense?  
>>>> Instead
>>>> of running the script twice, run it once, dump the db, and then
>>>> import the dump?).
>>> Don -
>>> I do have a server that could be used, but it sounds like Nathan  
>>> has a
>>> better one.  He is/has downloading/downloaded the latest TIGER data.
>>> Both of us need to have a better understanding of the OSM current  
>>> data
>>> model than at present.  Pointers at particular documentation  
>>> would be
>>> helpful, otherwise I'll just look around the site and the code.
>>> What I think I understand is that the 1 sec insert cycle of the old
>>> Ruby code would still take weeks/months to do an import.  Is that
>>> right?
>>> If so, it seems that there's got to be a better way. I agree with  
>>> you
>>> that using seperate servers to do a higher speed import and then to
>>> dump the data from DB to DB directly would seem to be the smarter
>>> approach.
>>> Are you already familiar with the OSM data model and/or with the old
>>> Ruby import code?
>>> thomas
>>> Nathan,Don -- if y'all are subscribed to the Dev list, let me  
>>> know and
>>> I shan't cc: you directly.
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