The document discusses Apache HBase replication, which asynchronously copies data between HBase clusters. It uses a push-based architecture shipping write-ahead log (WAL) entries similarly to MySQL replication. Replication provides eventual consistency and preserves the atomicity of individual updates. Administrators can configure replication by setting parameters and managing peer clusters and queues stored in Zookeeper. Replicated edits flow from the replication source on a region server to the remote replication sink where they are applied.