code: public List<MemcachedServer> activeServers() {
          ArrayList<MemcachedServer> active = new ArrayList<MemcachedServer>(servers.length);
          for (MemcachedServer server : servers) {
              if (server.isActive()) {
                  active.add(server);
              }
          }
          return active;
      }
docs: Gets the list of <b>active</b> nodes within the bucket. An active node is one that
  is not failed over
  @return The list of active nodes in the cluster.