[mapserver-users] Mapcache question.

[thomas bonfort]

Jerl,
mapcache itself does not do any pruning of the caches it has created,
but you can get the same effect by using a cache backend that supports
expiration (i.e. memcache).
Mapcache can fit your need, provided:
- you configure your tileset with a "targetdate" <dimension>- you use
a memcache backend to store the created tiles, and set an <expires>
value in mapcache to 5 hours
If the memory requirement for storing 5 hours worth of tiles is too
important for a memcache server instance, you can have a look at
membase which will also store less frequently used data to disk. The
membase protocol is compatible with memcache, so you can use either
memcache or membase with the same mapcache configuration.

Of course, by running a script every hour to delete expired tiles as
you are doing now, you can then use the classic disk based cache
backend.
regards,
thomas
On Sun, Dec 4, 2011 at 20:13, forums <forums at craniumjuice.com> wrote:
> Hi:
>
> I hope this is the proper place to ask questions about Mapcache since it's
> been moved into the trunk of Mapserver.
>
> I'm wondering if Mapcache can help with a particular setup, and if so maybe
> some advice or direction on where to start?
>
> Here's the setup.  Every 5 minutes a new set of GeoTiffs are created in a
> new directory.  I create a tileindex for the GeoTiffs and use those in the
> map layer.  Every hour, anything more than 5hours old gets deleted.
> I have a single mapfile setup.
>
> The general layer is setup like:
>
>     LAYER
>         NAME 'IMG1'
>         METADATA
>             'wms_title'           'IMG 1'
>             'wms_srs'             'EPSG:4326'
>             'wms_extent'          'MINX MINY MAXX MAXY'
>             'default_targetdate' ''
>             'targetdate_validation_pattern' '^[0-9]{12}$'
>         END
>         STATUS ON
>         TILEINDEX '/PATH/TO/IMG/DIR/%targetdate%/TILEINDEX.shp'
>         TILEITEM 'Location'
>         TYPE RASTER
>     END
>
>
> I'm currently loading these images as overlays for Googlemaps. using the
> mode=tile&tilemode=gmaps...&targetdate=2011...etc.
> Problem is it's too slow. I end up loading hundreds of images, as I
> basically create an animation using sequential times.
>
> I'd like to be able to have a single mapcache config file, that will pass
> the date through to pull the proper shapefile, and have the result cached so
> next time it's loading off the disk.  MOST of the images end up being
> blank/transparent tiles.
>
> Is Mapcache a good choice for this?
> The front end for this is just a simple GoogleMaps viewport, but ends up
> loading multiple timeslots for display.  It generates the request URL (not
> currently in WMS fashion but could be).
>
> Thanks for any help I can get.
>
> Jerl
>
>
>
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