Fix Redis Master-Slave Switching Downtime

If the service becomes unavailable during the process of switching from Redis master to slave, you can take the following steps to resolve the issue:

1. Check network connection: Make sure the network connection between the primary and secondary servers is functioning properly by using the ping command to test connectivity.
2. Check the configuration file: Verify that the master-slave configuration in the Redis configuration file (redis.conf) is correct. Ensure that the configuration settings for the master server and the slave servers are properly configured.
3. Check the log file: Review the Redis log file to identify any errors or warnings in order to determine the cause of the malfunction.
4. Check the synchronization status of master and slave: Use the INFO command of Redis to check the synchronization status of the master and slave servers. If the synchronization status is not normal, you can try restarting the Redis instance.
5. Manually switch roles between master and slave: In case the primary server becomes unavailable, the slave server can manually be switched to the role of the primary server. Ensure that the data on the slave server is synchronized with the primary server at this time.
6. Check for hardware failures: Ensure that the server hardware is functioning properly, such as checking for damaged hard drives or checking the status of the memory.
7. Utilize Redis Sentinel: If you are using Redis Sentinel for monitoring and managing failover of master-slave replication, you can examine the configuration and logs of Sentinel to identify the cause of the issue, and take necessary measures to resolve it.
8. Seeking professional support: If the above methods fail to solve the issue, seeking support from the official Redis or other professional teams can help to resolve the problem more effectively.