[OSM-talk] Mapnik render queue stuck

[Kai Krueger]

JohnSmitty wrote:
> 
> make the changes and see if the tiles are
> refreshed in a reasonable time period.
> 

The way updates and rerenders work can be a bit complex its full detail. A
better explanation can be found at
http://help.openstreetmap.org/questions/178/how-often-does-the-main-mapnik-map-get-updated

If it works, it works fine, but when not, then it often behaves a bit
"unpredictable" unless you do know that detail.

But what is imo most likely happening is that the rendering server is at
capacity and thus can't deal with rerenders fast enough, so you won't see
the updates as quickly as you would hope. Also, when it reaches capacity, it
starts becoming a bit unpredictable what and when it renders things, as when
the queue is full it starts dropping render requests.

Since about one - two month the situation of queue overload has become
reasonably common (
http://munin.openstreetmap.org/openstreetmap/yevaud.openstreetmap/renderd_queue.html
) as the number of edits and thus amount of tiles needing to be regenerated
continues to grow.

So at the moment, a bit of lag is "expected" and doesn't necessarily mean
anything is "broken" other than not having enough resources.

Kai
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