It's nice to hear a success story about Redis Cluster. When I worked at Eventbrite we used Redis heavily, both for the usual use cases (caching, ephemeral storage like sessions) as well as at the core of services like reserved seating. We did our own sharding client side as a layer on top of the redis-py library and relied on sentinel to handle failover. After Redis Cluster was released, we had some interest in it, but were were nervous enough about the limitations in its capabilities and the additional complexity of operating it that we never experimented with it.
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