perf: spread initialisation load across cluster

Author: Sylvester Chin

lib/redis_client/cluster/command.rb

@@ -24,7 +24,7 @@ class << self
         def load(nodes)
           cmd = errors = nil
 
-          nodes&.each do |node|
+          nodes&.shuffle_each do |node|
             reply = node.call('COMMAND')
             commands = parse_command_reply(reply)
             cmd = ::RedisClient::Cluster::Command.new(commands)

lib/redis_client/cluster/node.rb

@@ -201,6 +201,10 @@ def each(&block)
         @topology.clients.each_value(&block)
       end
 
+      def shuffle_each(&block)
+        @topology.clients.values.shuffle!.each(&block)
+      end
+
       def sample
         @topology.clients.values.sample
       end