How to separate reading and writing in redis

Adopting a read-write separation architecture, by creating a master-slave replication group, write operations are handed over to the master instance, and read operations are handed over to the slave instances, thereby improving the performance and availability of Redis.

Redis read-write separation

In order to improve the performance and availability of Redis, a read-write separation architecture is usually adopted.

Principle

Read and write separation is achieved by creating a master-slave replication group. The master instance handles all write operations, while the slave instance handles all read operations.

Benefits

• Improve performance: The slave instance shares the read load, reducing the pressure on the master instance.
• Improve availability: If the master instance is unavailable, the slave instance can continue to process read operations to ensure data availability.
• Reduced latency: Because read operations are handled from the instance, users have lower latency reading data.

Configuration

Redis read-write separation can be configured through the following steps:

1. Create a master instance.
2. Create multiple slave instances for the master instance.
3. Configure the slaveof option of the slave instance so that it connects to the master instance.
4. Configure multiple connection pools in the client application, one connection pool is used to connect to the master instance, and the other is used to connect to the slave instance.

Note

• Write operations on the master instance are not automatically replicated to the slave instance.
• All write operations on the slave instance will be ignored.
• If the master instance fails, the slave instance will not be automatically promoted to the master instance.
• Read-write separation does not apply to transactions because transactions involve multiple write operations.

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