[OSM-dev] History File Formats
frederik at remote.org
Wed May 11 17:14:14 BST 2011
On 05/11/11 15:31, Brett Henderson wrote:
> I then used the osc file format to create not only the commonly used
> daily/hourly/minutely replication files, but also a complete dump of
> database history updated daily (stored in one file per day).
> I was slightly surprised then to see the creation of the new full
> history files.
I wasn't sure what these are, and I think I am still confused. What is
the difference between the daily replication file and the file in
/history/? Assuming I want to have a local, current full history file,
how can I use these diffs to amend an existing full file that I have?
> But I do wonder why we've now gone back to a single
> massive file approach which is updated rarely and requires a full
> download each time when the existing files allow incremental download of
> recent changes.
Is it so bad to generate a full history file four times a year? I
haven't done the maths but I guess that downloading 300 daily diffs and
applying them to a 300-day old history file will take some time too.
What happens if users change their account names, or set their "public"
> It leaves me with a few questions:
> * Are the Osmosis-based daily full history extracts even used?
> Should I disable/delete them?
I'm not using them but mainly because I don't know how ;)
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