Question 121642 in Redis Question posted in
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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.

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  1. 0

    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.

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  2. 0

    Master would join as a replica.

    …The master will then demote itself to a replica…
    https://redis.io/commands/failover

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