Data Replication
Each index in Xapiand is divided into shards and each shard can have multiple copies. These copies are known as a replicas and must be kept in sync when documents are added or removed. If we fail to do so, reading from one copy will result in very different results than reading from another. The process of keeping the shard copies in sync and serving reads from them is what we call the data replication.
This section is a work in progress…