![]() Other nodes are working properly, and to send cluster messages needed to In order to discover new nodes, to send ping packets to make sure all the Nodes use a gossip protocol to propagate information about the cluster TCP bus and a binary protocol, called the Redis Cluster Bus.Įvery node is connected to every other node in the cluster using the clusterīus. To perform their tasks all the cluster nodes are connected using a To continue to operate when a failure occurs. Nodes, and promote replica nodes to master when needed in order In Redis Cluster, nodes are responsible for holding the data,Īnd taking the state of the cluster, including mapping keys to the right nodes.Ĭluster nodes are also able to auto-discover other nodes, detect non-working Client and Server roles in the Redis cluster protocol We only support database 0 the SELECT command is not allowed. Redis Cluster does not support multiple databases like the standalone version While single-key operations are always available. Manual resharding, multi-key operations may become unavailable for some time To force certain keys to be stored in the same hash slot. Redis Cluster implements a concept called hash tags that can be used Operations like set unions and intersections are implemented for cases whereĪll of the keys involved in the operation hash to the same slot. Redis Cluster implements all the single key commands available in the What is described in this document is implemented in Redis 3.0 or greater. Moreover using replicas migration, masters no longer replicated by any replica will receive one from a master which is covered by multiple replicas. Availability: Redis Cluster is able to survive partitions where the majority of the master nodes are reachable and there is at least one reachable replica for every master node that is no longer reachable.Windows to lose acknowledged writes are larger when clients are in a minority partition. Usually there are small windows where acknowledged writes can be lost. Acceptable degree of write safety: the system tries (in a best-effort way) to retain all the writes originating from clients connected with the majority of the master nodes.There are no proxies, asynchronous replication is used, and no merge operations are performed on values. High performance and linear scalability up to 1000 nodes.Redis Cluster is a distributed implementation of Redis with the following goals in order of importance in the design: Main properties and rationales of the design Redis Cluster goals In progress as it is continuously synchronized with the actual implementation Here you'll find informationĪbout the algorithms and design rationales of Redis Cluster. Welcome to the Redis Cluster Specification.
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