[MapProxy] mapproxy-seed: why re-request tiles that are in cache?

[Anne Blankert]

Hello,

If I remember correctly, mapproxy-seed should only request new data from
the remote source if the tiles in the cache are out of date or not
available?

According to documentation, https://mapproxy.org/docs/nightly/seed.html,
there are mapproxy-seed options '--continue' and '--progress-file'. Why do
these options exist? mapproxy-seed could find existing tiles in the cache
and quickly skip tiles until it finds out-of-date or non-existing tiles?

I am suspecting there is something wrong in my configuration. File
permissions in the cache seem to be correct and I see the cache is being
filled by mapproxy-seed. However, if I restart mapproxy-seed, the seeding
starts requesting data from the remote source also for tiles that are
already in the cache.

Is this re-requesting by design or is something wrong in my configuration?

My seed.yaml:
seeds:
nextzenelevation:
caches: [nextzenelevation_cache]
grids: [webmercator]
levels:
from: 0
to: 3

My cache definition:
caches:
nextzenelevation_cache:
sources: [nextzenelevation_tiles]
format: image/png
grids: [webmercator]

sources:
nextzenelevation_tiles:
type: tile
url:
https://tile.nextzen.org/tilezen/terrain/v1/256/terrarium/%(tms_path)s.%(format)s?api_key=xxxx
grid: webmercator

grids:
webmercator:
srs: EPSG:900913
origin: nw

[Anne Blankert]

Yes there was a problem in my configuration.

globals:
cache:
base_dir: 'path_to_caches_dir'
lock_dir: 'path_to_lock_dir'

In my case 'path_to_lock_dir' was pointing to a non-existing directory

Anne

Post by Anne Blankert
Hello,
If I remember correctly, mapproxy-seed should only request new data from
the remote source if the tiles in the cache are out of date or not
available?
According to documentation, https://mapproxy.org/docs/nightly/seed.html,
there are mapproxy-seed options '--continue' and '--progress-file'. Why do
these options exist? mapproxy-seed could find existing tiles in the cache
and quickly skip tiles until it finds out-of-date or non-existing tiles?
I am suspecting there is something wrong in my configuration. File
permissions in the cache seem to be correct and I see the cache is being
filled by mapproxy-seed. However, if I restart mapproxy-seed, the seeding
starts requesting data from the remote source also for tiles that are
already in the cache.
Is this re-requesting by design or is something wrong in my configuration?
caches: [nextzenelevation_cache]
grids: [webmercator]
from: 0
to: 3
sources: [nextzenelevation_tiles]
format: image/png
grids: [webmercator]
type: tile
https://tile.nextzen.org/tilezen/terrain/v1/256/terrarium/%(tms_path)s.%(format)s?api_key=xxxx
grid: webmercator
srs: EPSG:900913
origin: nw