Redis Master-Slave Failover Data Recovery

If data loss occurs during the Redis master-slave failover process, you can retrieve the data using the following methods:

1. Firstly, check the status of the Redis master-slave synchronization to ensure that the synchronization between the master and slave is functioning properly.
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4. If master-slave synchronization is unable to be restored, one option is to use Redis RDB persistence files to recover data. RDB files are snapshots generated by Redis during regular or manual persistence operations, containing all key-value pairs of the current dataset. Data can be restored by copying the RDB file to the slave node and loading it.
5. In addition, if the AOF persistence feature of Redis is enabled, you can try using the AOF file to recover data. The AOF file is a log file generated by Redis for each write operation, recording all write commands. Data can be restored by copying the AOF file to a replica and re-activating it.
6. If the above method fails to recover the data, you may consider restoring the data from other backups or snapshots. If there are regular backups or snapshots of the data stored by other means, you can try to restore the data from the backup or snapshot.
7. If there are no backups or snapshots available, data recovery could be very challenging or even impossible. In such cases, it may be necessary to consider rebuilding the data or accepting the permanent loss of data.

In conclusion, it is recommended to regularly back up and monitor the synchronization status between master and slave when using Redis master-slave mode to prevent data loss and promptly address any synchronization issues.