Pivotal GemFire Version Compatibility Rules
This topic describes the compatibility rules for deploying different versions of Pivotal GemFire.
GemFire clients can run version 8.2.2 of GemFire and still connect to GemFire servers running version 9.x. Version 9.x clients, however, cannot connect to servers running older versions of GemFire.
In multi-site (WAN) deployments, one site can be running GemFire 8.2.2 and another site running GemFire 9.x and the sites should still be able to communicate with one another.