Couchbase XDCR

Cross-Datacenter Replication (XDCR) replicates data between Couchbase clusters — across data centers, cloud regions, or hybrid environments.

How XDCR Works

An XDCR agent runs on the source cluster and pushes mutations to the target cluster via the Database Change Protocol (DCP). Replication is:

• Asynchronous — mutations are pushed after they are committed on the source
• Bucket-to-bucket — a replication is defined from a source bucket to a target bucket
• Scope/collection-aware — you can map specific scopes/collections (7.1+)

Source Cluster                    Target Cluster
  Bucket A  ──── XDCR agent ────▶  Bucket B
  (active)       (push via DCP)    (replica or active)