anchor.diff:  -export([start_link/0, init/1, handle_call/3, handle_cast/2,
            handle_info/2, terminate/2, code_change/3]).
   
  --export([lookup/3, lookup_urls/0, urls/0
  +-export([lookup/3
  +         ,logs_redis_urls/0
  +         ,urls/0
            ,redis_sort/1]).
   
   %% Redis Migration API
  
positive.code: %%--------------------------------------------------------------------
  init([]) ->
      ?INFO("at=init", []),
      Urls = lookup_urls(),
  
      erlang:process_flag(trap_exit, true),
  
  
negative.code: %%--------------------------------------------------------------------
  %%% Internal functions
  %%--------------------------------------------------------------------
  logs_redis_urls() ->
      URLs = case os:getenv("LOGPLEX_SHARD_URLS") of
                 [] ->
                     case os:getenv("LOGPLEX_CONFIG_REDIS_URL") of
  