使用zk-shell，我
不能使用此方法，因为它不复制用于零件块编号的自动增量值。
有更简单的方法。你可以通过添加新的ZK节点作为追随者来迁移ZK集群。

Here is a plan for ZK 3.4.9 (no dynamic reconfiguration):
1. Configure the 3 new ZK nodes as a cluster of 6 nodes (3 old + 3 new), start them. No changes needed for the 3 old ZK nodes at this time.
    The new server would not connect and download a snapshot, so I had to start one of them in the cluster of 4 nodes first.
2. Make sure the 3 new ZK nodes connected to the old ZK cluster as followers (run echo stat | nc localhost 2181 on the 3 new ZK nodes)
3. Confirm that the leader has 5 synced followers (run echo mntr | nc localhost 2181 on the leader, look for zk_synced_followers)
7. Remove the 3 old ZK nodes from zoo.cfg on the 3 new ZK nodes.
8. Stop data loading in CH (this is to minimize errors when CH loses ZK).
4. Change the zookeeper section in the configs on the CH nodes (remove the 3 old ZK servers, add the 3 new ZK servers)
5. Restart all CH nodes (CH must restart to connect to different ZK servers)
6. Make sure there are no connections from CH to the 3 old ZK nodes (run echo stat | nc localhost 2181 on the 3 old nodes, check their Client ssection).
11. Turn off the 3 old ZK nodes
9. Restart the 3 new ZK nodes. They should form a cluster of 3 nodes.
10. When CH reconnects to ZK, start data loading.

Altinity KB