private MemcachedNode findNode(SocketAddress sa) {
    MemcachedNode node = null;
    for (MemcachedNode n : mconn.getLocator().getAll()) {
      if (n.getSocketAddress().equals(sa)) {
        node = n;
      }
    }
    assert node != null : "Couldn't find node connected to " + sa;
    return node;
  }
Remove a connection observer.

@param obs the ConnectionObserver you wish to add
@return true if the observer existed, but no longer does
src/main/java/net/spy/memcached/MemcachedClient.java