[OSM-dev] [OSM-talk] Abstract on getting historic information about usage of a node

Ian Dees ian.dees at gmail.com
Wed Sep 16 15:52:56 BST 2009


On Wed, Sep 16, 2009 at 9:30 AM, Tom Hughes <tom at compton.nu> wrote:

>
> This is NOT true. As I explained yesterday there is a very good reason
> why we do not store a node revision in current_way_nodes and way_nodes.
>
> The problem is that if you do that then every time a node is changed you
> have to go and find every way which uses that node and update it to use
> the new version of the node. So it costs CPU time every time a node
> is changed.
>

Can a way assume that it uses the most recent version of a node until the
way is changed? Then, when a way's revision number increments, all of the
rev#'s for the nodes that make up that way are saved along with the way's
history.
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