{"host": "192.168.170.101", "port": "10004"},
{"host": "192.168.170.101", "port": "10005"},
{"host": "192.168.170.101", "port": "10006"}
]
redis_conn = StrictRedisCluster(startup_nodes=redis_nodes, decode_responses=True)
for key in range(0, 100000):
#value = key
key = 'zhang%s' % key
#redis_conn.set(key, value)
print redis_conn.get(key)
执行完毕，数据较验完成，数据完成完整迁移
最后，将redis002从集群中移除
[root@lab001 redis]# redis-trib.rb del-node 192.168.170.101:10001 6036af6afc6567b74ce2fecc734a2d3908d561d1
>>> Removing node 6036af6afc6567b74ce2fecc734a2d3908d561d1 from cluster 192.168.170.101:10001
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[2] Done ./redis001/bin/redis-server redis00$i/redis00$i.conf
再次查看集群状态
[root@lab001 redis]# redis-trib.rb check 192.168.170.101:10001
>>> Performing Cluster Check (using node 192.168.170.101:10001)
M: b30fdabd07a4bef611c160828965b91a1cdd462a 192.168.170.101:10001
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 7c1a0acf84b2cf08876036b07518fb8f2ea9b8f8 192.168.170.101:10007
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 74805544792cc22f09af941fa117b2974c9c0abf 192.168.170.101:10005
slots: (0 slots) slave
replicates 7c1a0acf84b2cf08876036b07518fb8f2ea9b8f8
M: 9c6a98926b23585e2eeb49ae17cc77521041d3ed 192.168.170.101:10003
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 57a2e7313b952b38e32d6a1030d4812ea4decb5f 192.168.170.101:10006
slots: (0 slots) slave
replicates 9c6a98926b23585e2eeb49ae17cc77521041d3ed
S: 58b7b25501fdba04aef9b8cb47edef89092f10a7 192.168.170.101:10004
slots: (0 slots) slave
replicates b30fdabd07a4bef611c160828965b91a1cdd462a
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@lab001 redis]# redis-trib.rb info 192.168.170.101:10001
192.168.170.101:10001 (b30fdabd...) -> 33357 keys | 5461 slots | 1 slaves.
192.168.170.101:10007 (7c1a0acf...) -> 33283 keys | 5462 slots | 1 slaves.
192.168.170.101:10003 (9c6a9892...) -> 33360 keys | 5461 slots | 1 slaves.
[OK] 100000 keys in 3 masters.
6.10 keys per slot on average.
总结：
1. slots迁移在日常工作中，通常用于节点迁移、扩展，也可以根据服务器本身的压力将slots迁移至性能较优的服务器
2. slots迁移过程当中，不影响数据的读写，这点已经做过实际的测试。
3. 迁移过程当中，应用配置应当至少包含一个集群master节点信息，否则有可能会造成数据访问异常的情况。迁移完成并配置同步更新至最新后，方可删除旧的空slots节点。