Redis Cluster: delay state change when in the majority again.
As specified in the Redis Cluster specification, when a node can reach the majority again after a period in which it was partitioend away with the minorty of masters, wait some time before accepting queries, to provide a reasonable amount of time for other nodes to upgrade its configuration. This lowers the probabilities of both a client and a master with not updated configuration to rejoin the cluster at the same time, with a stale master accepting writes.
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