code: public List<MasterBlockLocation> getBlockLocations() {
      List<MasterBlockLocation> ret = new ArrayList<>(mWorkerIdToAlias.size());
      for (Map.Entry<Long, String> entry : mWorkerIdToAlias.entrySet()) {
        ret.add(new MasterBlockLocation(entry.getKey(), entry.getValue()));
      }
      return ret;
    }
docs: Gets the net addresses for all workers which have the block's data in their tiered storage.
  
  @return the net addresses of the workers