On Sun, Dec 14, 2008 at 7:24 PM, Stefan de Konink <[email protected]> wrote:
> Stefan de Konink wrote: > >> 80n wrote: >> >>> I'm wondering if perhaps we can compute some kind of rolling checksum >>> that can be compared between data sources. It would then be quick and easy >>> to see if any server was ok just by comparing it's checksum to that of >>> others at any given minute. >>> >> >> Amount of visible tags + timestamp of latest update in there. >> > > Extendable with bbox. > > Are you saying, very simply, a count of all the tags for nodes, ways and relations for any given timestamp? For example: 2008-12-15 08:04 = 898266982 2008-12-15 08:05 = 898278312 2008-12:15 08:06 = 898279938 etc I was thinking of something with a little bit more granularity, such as the sum of the seconds component of each time stamp. This would also, I think, be quicker to recalculate if needed. If the checksum was stored in a table for every minute diff update then, if something goes wrong, it would be easy to see when it went wrong, and make it easier to correct by re-running diffs from that moment. 80n > > Stefan >
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