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Cluster: check that configEpoch never goes back.
Since there are ways to alter the configEpoch outside of the failover procedure (for exampel CLUSTER SET-CONFIG-EPOCH and via the configEpoch collision resolution algorithm), make always sure, before replacing our configEpoch with a new one, that it is greater than the current one.
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@ -2516,7 +2516,8 @@ void clusterHandleSlaveFailover(void) {
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}
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/* 3) Update my configEpoch to the epoch of the election. */
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myself->configEpoch = server.cluster->failover_auth_epoch;
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if (myself->configEpoch < server.cluster->failover_auth_epoch)
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myself->configEpoch = server.cluster->failover_auth_epoch;
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/* 4) Update state and save config. */
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clusterUpdateState();
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