Couchbase XDCR vs TiCDC

Couchbase XDCR is a web-based service for replicating database changes between clusters. It supports change data capture and bidirectional synchronization, allowing changes to move in both directions. The deployment model is hybrid. Couchbase lists plans with hourly per-node billing, cluster minimums, and backup intervals. Basic is $0.15 a month, billed from $0.15/hr per node, with a one-node minimum and a 24-hour backup interval. Developer Pro is $0.35 a month, billed from $0.35/hr per node, with a one-node minimum, three nodes for multiple cluster availability zones, and backup intervals up to one hour. Enterprise is $0.49 a month, billed from $0.49/hr per node, with a three-node minimum and backup intervals up to one hour. Couchbase Enterprise is $0.66 a month, billed from $0.66/hr per node through cloud marketplaces, and includes Couchbase Server 8. A Free plan is described as one node and 8GB, although the pricing facts mark no free plan. Couchbase was founded in 2011 and is headquartered in San Jose.

TiCDC is a free, open-source, self-hosted tool for replicating incremental data changes from TiDB. It captures TiKV change logs, sorts the changes, and exports row-based data to systems including TiDB, MySQL-compatible databases, Kafka, Amazon S3, GCS, Azure Blob Storage, and NFS. Recommended Kafka formats include Canal-JSON, Avro, and Debezium. Filters can select databases, tables, DMLs, and DDLs, while the Open API can check task status, change task configuration, and create or delete tasks. TiCDC supports replication between TiDB clusters for disaster recovery, with second-level RPO and minute-level RTO, as well as bidirectional replication for multi-active deployments. It can be deployed with a new cluster or added to an existing one; production guidance recommends at least two instances. The system has no single point of failure and allows nodes to be added or removed dynamically. Delivery is at least once, so failures can lead to repeated statements or Kafka messages.