anchor.diff:      do_upgrade_files_from_2_0_to_2_2_0(DataDir),
       do_upgrade_config_from_2_0_to_2_2_0(Config, DefaultConfig, DataDir).
   
  -upgrade_config_from_2_2_0_to_3_0(Config) ->
  -    ?log_info("Upgrading config from 2.2.0 to 3.0"),
  +upgrade_config_from_2_2_0_to_2_3_0(Config) ->
  +    ?log_info("Upgrading config from 2.2.0 to 2.3.0"),
       {value, MemcachedConfig} = ns_config:search(Config, {node, node(), memcached}),
       MemcachedConfig1 = lists:keystore(log_generations, 1, MemcachedConfig,
                                         {log_generations, 20}),
  
positive.code:             [{set, {node, node(), config_version}, {2,2,0}} |
               upgrade_config_from_2_0_to_2_2_0(Config)];
          {value, {2,2,0}} ->
              [{set, {node, node(), config_version}, {3,0,0}} |
               upgrade_config_from_2_2_0_to_3_0(Config)]
      end.
  
  upgrade_config_from_1_7_to_1_7_1() ->
  
negative.code: -define(NS_LOG, "ns_log").
  
  get_current_version() ->
      {2,3,0}.
  
  % Allow all keys to be mergable.
  
  