Collection<ClusterNode> aliveCacheNodes(@Nullable String cacheName,final long topVer){
  return filter(topVer,aliveCacheNodes.get(maskNull(cacheName)));
}

Collection < ClusterNode > aliveCacheNodes ( @ Nullable String cacheName , final long topVer ) { return filter ( topVer , aliveCacheNodes . get ( maskNull ( cacheName ) ) ) ; }
gets all alive nodes that have cache with given name .
