How does one upgrade to a newer version of Redis with zero downtime? Redis slaves are read-only, so it seems like you'd have to take down the master and your site would be read-only for 45 seconds or more while you waited for it to reload the DB.
Is there a way around this?
question from:https://stackoverflow.com/questions/4719346/redis-master-slave-replication-single-point-of-failure