[OSM-dev] Incomplete diffs?

marqqs at gmx.eu marqqs at gmx.eu
Sat Nov 5 17:58:39 GMT 2011


Hi all,

this week, a user of osmupdate and osmfilter asked me for help. The filter program's output contained a certain way but not all of its nodes. This must not happen, of course, and I thought this would be a program error at first.

Meanwhile I found out that this node simply did not appear in the daily diffs:
http://www.openstreetmap.org/browse/node/1470178889

It was crated at 2011-10-16T23:58Z by a large changeset along with 23.000 other nodes.
Neither the 16/17 nor the 17/18 daily diff contain this node whereas the hourly diff from October 17 01:00 does.

How often does this happen? Is there a statistic about such gaps?

Should I better switch to hourly diffs instead of daily ones? This would increase the data traffic a bit as hourly diffs do not cumulate multiple versions for each object.

Markus



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