How different instances of redis communicate

There are several mechanisms for communication between Redis instances: Pub/Sub: Publish/Sub mode, allowing efficient and low-latency messaging. Cluster mode: distributed deployment method, providing high availability and fault tolerance. Cross-instance Command: Allows commands to be sent directly to another instance, suitable for temporary operational or administrative purposes.

Redis Communication between different instances

Redis, as a distributed cache, can operate with multiple instances together. To enable communication between different instances, there are a variety of mechanisms to choose from:

1. Pub/Sub

Pub/Sub is a publish/subscribe model that allows one instance (publisher) to send messages to multiple instances (subscribers). Subscribers can receive messages sent by publishers by subscribing to a channel.

Implementation method:

• Create a channel ( SUBSCRIBE channel )
• Publish a message ( PUBLISH channel message )

advantage:

• High efficiency, low latency
• Supports broadcast or point-to-point communication

2. Cluster mode

The Cluster pattern is a distributed deployment method that allows multiple Redis instances to form a cluster. Instances in the cluster automatically discover each other and maintain a master-slave hierarchy.

Implementation method:

• Create a cluster using the redis-cluster tool
• Configure cluster information for each instance ( cluster-config-file )

advantage:

• High availability and fault tolerance
• Automatic failover

3. Cross-instance Command

Cross-instance Command allows one instance to send Redis commands directly to another instance. It is achieved by establishing a TCP connection on the IP and port of the target instance.

Implementation method:

• Use redis-cli or other Redis clients
• Connect to the target instance ( -h host -p port )
• Send command ( command arg1 arg2 ... )

advantage:

• Directly query different instances
• Can be used for debugging or management purposes

Notice:

• Cross-instance Command is usually used for temporary operations and is not suitable for high concurrency scenarios.
• Pub/Sub and Cluster modes are better suited for applications that require reliable, high-performance communications.

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