Integrity: Issues such as conflict resolution can become intractable as the number of nodes involved rises and latency increases.Performance: Eager replication systems are complex and increase communication latency.lazy and asynchronous, violating ACID properties. Consistency: Most multi-master replication systems are only loosely consistent, i.e.Distributed Access: Masters can be located in several physical sites, i.e.Availability: If one master fails, other masters continue to update the database.The primary purposes of multi-master replication are increased availability and faster server response time. Often, communication and replication in Multi-master systems are handled via a type of Consensus algorithm, but can also be implemented via custom or proprietary algorithms specific to the software. The master is the only server active for client interaction. Multi-master replication can also be contrasted with failover clustering where passive replica servers are replicating the master data in order to prepare for takeover in the event that the master stops functioning. Allowing only a single master makes it easier to achieve consistency among the members of the group, but is less flexible than multi-master replication. Other members wishing to modify the data item must first contact the master node. Multi-master replication can be contrasted with primary-replica replication, in which a single member of the group is designated as the "master" for a given piece of data and is the only node allowed to modify that data item. The multi-master replication system is responsible for propagating the data modifications made by each member to the rest of the group and resolving any conflicts that might arise between concurrent changes made by different members. All members are responsive to client data queries. Multi-master replication is a method of database replication which allows data to be stored by a group of computers, and updated by any member of the group. ( May 2012) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
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