@Override
  public Collection<SocketAddress> getUnavailableServers() {
    ArrayList<SocketAddress> rv = new ArrayList<SocketAddress>();
    for (MemcachedNode node : mconn.getLocator().getAll()) {
      if (!node.isActive()) {
        rv.add(node.getSocketAddress());
      }
    }
    return rv;
  }
Get the addresses of unavailable servers.

<p>
This is based on a snapshot in time so shouldn't be considered completely
accurate, but is a useful for getting a feel for what's working and what's
not working.
</p>

@return point-in-time view of currently available servers
src/main/java/net/spy/memcached/MemcachedClient.java