'Redis HA what happens if Master stops and restarted
In a Redis HA setup, with 1 master and 5 replicas: Let's suppose the master goes down. Then the Sentinels would elect a replica as the next master.
What happens when the original master is restarted with its config? Would it be joining as a master or as a replica? I suppose, since it is not configured as a replica, so it should not be running as a replica.
Solution 1:[1]
When the original master is down and a new master is elected. The original master will be added as a virtual replica of the new master. When it recovers, original master will be set to be a replica of the new master automatically.
Solution 2:[2]
Master would join as a replica.
...The master will then demote itself to a replica... https://redis.io/commands/failover
Sources
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Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | for_stack |
| Solution 2 |