[mapserver-users] Mapcache and partial reseeding

[thomas bonfort]

On 7 June 2013 17:48, Rahkonen Jukka <jukka.rahkonen at mmmtike.fi> wrote:

> Hi,
>
> How well does Mapcache seeder tool handle the case when the original big
> aerial image coverage is updated little by little so that the hole cycle
> takes 3 to 6 years? Reseeding the whole cache every time when a batch of
> new images is received does not feel like a reasonable solution.
>
you can look into the ogr support in the seeder, by giving a
wkt/shapefile/whatever of the area you want to reseed.

>
> A) Can the seeder tool ake a fast delete for all tiles which intersect the
> update area geometry so that it is guaranteed that outdated tiles are not
> delivered.  Only high zoom levels (Z greater than X) should be purged. Low
> zoom levels may stay as they are because they are not used for
> interpretation.
>
depends on what you call fast... the tiles intersecting the area of
interest need to be iterated and deleted, depending on the area and zoom
levels that can take some time.
mode=delete
ogr source => where you want to delete tiles
zoom=X,21

> B) Can the seeding tool reseed those areas?
>
force
ogr source
zoom=X,21

> C) Is the behaviour similar for disk cache and Berkeley DB cache?
>
the behavior is identical. the performance is up to you to measure (I have
no metrics to give you).

regards,
thomas

>
> -Jukka Rahkonen-
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