content_image/858232.jpg
<img src='content_image/858232.jpg'>

In this scenario, SQL node A in Cluster 1 replicates to SQL node C in Cluster 2; SQL node C replicates to SQL node E in Cluster 3; SQL node E replicates to SQL node A. In other words, the replication line (indicated by the curved arrows in the diagram) directly connects all SQL nodes used as replication sources and replicas. 

It is also possible to set up circular replication in such a way that not all source SQL nodes are also replicas, as shown here: 

