Redis master-slave replication is a mechanism to achieve data redundancy and high availability, which is implemented through the following steps: establishing connections, partial replication, incremental replication, updating status and synchronization. It has advantages such as data redundancy, high availability, load balancing and disaster recovery, but it should also be noted for its one-way replication, asynchronous replication, network latency and expired data.
Redis master-slave replication implementation
Redis's master-slave replication is a data redundancy mechanism that allows one Redis server (master server) to synchronize data to other Redis servers (slave server). This provides backup and failover capabilities to ensure data reliability and high availability.
Implementation method
Redis's master-slave replication is implemented through the following steps:
- Establish a connection: Send a copy request to the master server to establish a network connection.
- Partial replication: The master server sends a snapshot file containing its own status information to the slave server.
- Incremental replication: After receiving a new write operation, the master server will send these operations incrementally to the slave server.
- Update status: Update incrementally from the server application to update your own data.
- Synchronization Complete: When the slave server catches up with the state of the master server, the replication process is completed.
Advantages
Redis master-slave replication provides the following advantages:
- Data redundancy: The slave server stores a copy of the master server data and provides data backup.
- High Availability: If the master server fails, the slave server can quickly take over to ensure service continuity.
- Load balancing: When there are multiple slaves, read operations can be spread over them, reducing the load on the master.
- Disaster recovery: The slave server can act as a backup for the master to recover data after a disaster occurs.
Note
When using Redis master-slave replication, you need to pay attention to the following points:
- One-way replication: The slave server can only receive updates from the master server and vice versa.
- Asynchronous replication: The replication process is asynchronous and the slave may lag behind the master.
- Network Delay: If there is network delay between the master and slave servers, the replication process may be affected.
- Expired data: When data on the primary server expires, the copy on the slave server does not expire automatically.
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