Shulou(Shulou.com)06/01 Report--

First, take a look at the redis cluster topology.

Introduction to redis Cluster:

1. Redis cluster is an acentric structure in which each node holds the data and the state of the entire cluster.

2. Each node will save the information of other nodes and will know the hash slot (hash slot) that other nodes are responsible for.

3. The heartbeat information will be sent regularly with other nodes, and the abnormal nodes in the cluster can be sensed in time.

Features of redis cluster structure:

1. All redis nodes are interconnected with each other (PING-PONG mechanism), and binary protocol is used internally to optimize the transmission speed and band library.

2. The fail of a node takes effect only when it is detected by more than half of the nodes in the cluster.

3. The client is directly connected to the redis node and does not require an intermediate proxy layer.

The client does not need to connect to all the nodes in the cluster, but to any of the available nodes in the cluster.

4. Redis cluster maps all physical nodes to slot (not necessarily evenly distributed)

5. Redis cluster is pre-divided into 16384 slots [0-16383]

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