anchor.diff:                             vnode_pid=VNPid,
                              trees=orddict:new(),
                              built=false,
  +                           expired=false,
                              path=Path},
               State2 = init_trees(IndexNs, State),
               %% If vnode is empty, mark tree as built without performing fold
  
positive.code: -record(state, {index,
                  vnode_pid,
                  built,
                  lock :: undefined | reference(),
                  path,
                  build_time,
  
negative.code:     hashtree:write_meta(<<"built">>, <<1>>, Tree0),
      hashtree:write_meta(<<"build_time">>, term_to_binary(BuildTime), Tree0),
      riak_kv_entropy_info:tree_built(Index, BuildTime),
      State#state{built=true, build_time=BuildTime, expired=false}.
  
  %% Determine the build time for all trees associated with this
  %% index. The build time is stored as metadata in the on-disk file. If
  