[mapguide][MG181][Modified] Tile cache can get out-of-date if tile server goes offline

[Walt Welton-Lair]

You can view the artifact detail at the following URL:

    https://mapguide.osgeo.org/servlets/Scarab/id/MG181

Type:
Defect

Artifact ID:
MG181 (Tile cache can get out-of-date if tile server goes offline)

Modified by:
Walt Welton-Lair
waltweltonlair (walt.welton-lair at autodesk.com)

The following modifications were made to this artifact:
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-- Developer Notes set to new value:
In the case where you have a single support server hosting the tile service, there needs to be a mechanism where the tile cache is validated at startup time:
- for each tiled map, get a "last modified" time and compare that to the cached tiles for that map
- delete any tiles older than this time
- the time needs to account for any of the map's dependencies (layer definitions, feature sources, etc).

In the case where we have multiple tile servers, the long term plan is to have each server keep an identical copy of the tiles.  In this case a tile server that comes online would need to sync itself up to the other servers.




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