This page describes an older version of the product. The latest stable version is 12.2.
The GigaSpace.change and the ChangeSet allows updating existing objects in Space, by specifying only the required change instead of passing the entire updated object.
Change API overview.
A custom change operation lets the user implement his own change operation.
Advanced Change Options
A SpaceSynchronizationEndpoint implementation can make use of the Change API and support change operation.