TopologyContext systemTopology = systemContext.make(null);
// ˢ������
RefreshConnections refreshConn = makeRefreshConnections(taskids);
refreshConn.run();
// ˢ��zk�е�active״̬
RefreshActive refreshZkActive = new RefreshActive(active, conf,
zkCluster, topologyId, zkActive);
refreshZkActive.run();