原因是redis出错了。解决方法如下：
1、使用命令检查REDIS状态： /java/redis/redis7000/src/redis-trib.rb check 192.168.249.230:7000
[ERR] Nodes don‘t agree about configuration!
>>> Check for open slots...
[WARNING] Node 192.168.249.230:7001 has slots in importing state (4658).
[WARNING] The following slots are open: 4658
>>> Check slots coverage...
[OK] All 16384 slots covered.
2、使用命令修复REDIS： /java/redis/redis7000/src/redis-trib.rb fix 192.168.249.230:7001
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
通过以上两步即可解决：CLUSTERDOWN The cluster is down
原文链接：https://blog.csdn.net/yong472727322/article/details/76904565
解决spring4连接redis集群报错：CLUSTERDOWN The cluster is down（转载）
原文：https://www.cnblogs.com/hzcjd/p/12233229.html