Redis

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Shardex.Adapter.Redix requires :redix.

shards: [
  cache_1: {Shardex.Adapter.Redix, host: "redis-1", port: 6379},
  cache_2: {Shardex.Adapter.Redix, host: "redis-2", port: 6379, pool_size: 4}
]

All options except :pool_size go to Redix.start_link/1. With pool_size: 1 the ref is the connection name; with pool_size > 1 the ref is a %Shardex.Adapter.Redix.Pool{} and run/3 passes one connection name chosen at random:

MyApp.Cache.run(key, &Redix.command(&1, ["GET", key]))

MyApp.Cache.run_batch(keys, & &1, fn conn, keys ->
  Redix.command(conn, ["MGET" | keys])
end)