BigMemory 4.3.9 | Component Documentation | WAN Replication User Guide | About the WAN Replication Service | Replication Modes
 
Replication Modes
The BigMemory WAN Replication Service offers two replication modes:
*Unidirectional mode replicates data in one direction only, from Master to Replica, and is used for active-passive deployments such as disaster recovery.
*Bidirectional mode replicates data in two directions, from Master to Replica and from Replica to Master, and is used for active-active deployments where updates from more than one region should be incorporated into the Master cache's authoritative data set. Please review the section Bidirectional WAN Replication for an understanding of limitations.
The table below summarizes the two modes:
Unidirectional Replication
Bidirectional Replication
Active-Passive deployment
Active-Active deployment
The Master cache replicates cache element modifications to the Replica caches
Both Master and Replica caches replicate cache element modifications
Replica caches operate locally but do not replicate cache element modifications
The Master cache receives replications from the Replica caches
The Master cache maintains the authoritative data set but no element tracking is necessary
The Master cache tracks each cache element and maintains the authoritative data set
No conflict resolution necessary
Conflict resolution (localized updates strongly recommended)
Example use case: disaster recovery
Example use case: regional operations
The default mode is Unidirectional. To switch to Bidirectional mode, see Orchestrator Configuration Parameters. For more information about Bidirectional mode and conflict resolution, see Bidirectional WAN Replication.