FEATURE: Master-Slave Redis configuration with fallback and switch over.

config/initializers/001-redis.rb

@@ -1,3 +1,18 @@
+# https://github.com/redis/redis-rb/pull/591
+class Redis
+  class Client
+    alias_method :old_initialize, :initialize
+
+    def initialize(options = {})
+      old_initialize(options)
+
+      if options.include?(:connector) && options[:connector].is_a?(Class)
+        @connector = options[:connector].new(@options)
+      end
+    end
+  end
+end
+
 if Rails.env.development? && ENV['DISCOURSE_FLUSH_REDIS']
   puts "Flushing redis (development mode)"
   $redis.flushall