Redis Rb Cluster

Redis Cluster Ruby client based on redis-rb
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Redis Cluster client work in progress. It wraps Redis-rb, and eventually should be part of it.

For now the goal is to write a simple (but not too simple) client that works as a reference implementation, and can be used in order to further develop and test Redis Cluster, that is a work in progress itself.

Creating a new instance

In order to create a new Redis Cluster instance use:

startup_nodes = [
    {:host => "", :port => 6379},
    {:host => "", :port => 6380}
max_cached_connections = 2
rc =,max_cached_connections)

The startup nodes are a list of addresses of Cluster Nodes, for the client to work it is important that at least one address works. Startup nodes are used in order to:

  • Initialize the hash slot -> node cache, using the CLUSTER NODES command.
  • To contact a random node every time we are not able to talk with the right node currently cached for the specified hash slot we are interested in, in the context of the current request.

The list of nodes provided by the user will be extended once the client will be able to retrieve the cluster configuration.

The second parameter in the object initialization is the maximum number of connections that the client is allowed to cache. Ideally this should be at least equal to the number of nodes you have, in order to avoid closing and reopening TCP sockets. However if you have very large cluster and want to optimize for clients resource saving, it is possible to use a smaller value.

Sending commands

Sending commands is very similar to redis-rb:


Currently only a subset of commands are implemented (and in general multi-keys commands are not supported by Redis Cluster), because for every supported command we need a function able to identify the key among the arguments.


Redis Cluster is released as stable. This client is a work in progress that might not be suitable to be used in production environments.

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Redis Cluster