Keeping the Cache in Sync with Outside Data Sources
Keep your distributed cache in sync with an outside data source by programming and installing application plug-ins for your region.
Apache Geode has application plug-ins to read data into the cache and write it out.
By default, a region has no data loader defined. Plug an application-defined loader into any region by setting the region attribute cache-loader on the members that host data for the region.
Program a data loader and configure your region to use it.