redis连接异常 redis.clients.jedis.exceptions.JedisClusterException: CLUSTERDOWN The cluster is down

遇到一个问题，因为是在测试环境，之前退出使用的kill -9暴力方式，再重新启动redis集群的时候，先并没有恢复rdb和aof，使用redis-cli客户端可以连接，说明集群已经启动来了，但是使用jedis客户端代码连接不上，抛异常：

1、异常信息：

Exception in thread "main" redis.clients.jedis.exceptions.JedisClusterException: CLUSTERDOWN The cluster is down
   at redis.clients.jedis.Protocol.processError(Protocol.java:126)
   at redis.clients.jedis.Protocol.process(Protocol.java:166)
   at redis.clients.jedis.Protocol.read(Protocol.java:220)
   at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:318)
   at redis.clients.jedis.Connection.getBinaryBulkReply(Connection.java:255)
   at redis.clients.jedis.Connection.getBulkReply(Connection.java:245)
   at redis.clients.jedis.Jedis.get(Jedis.java:181)
   at redis.clients.jedis.JedisCluster$3.execute(JedisCluster.java:161)
   at redis.clients.jedis.JedisCluster$3.execute(JedisCluster.java:158)
   at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:106)
   at redis.clients.jedis.JedisClusterCommand.run(JedisClusterCommand.java:25)
   at redis.clients.jedis.JedisCluster.get(JedisCluster.java:163)
   at com.study.cache.JedisTest.main(JedisTest.java:17)

2、在网上找了一下原因，可能是之前配置文件开启了 protected-mode yes，现在都改为 no；

3、重启redis集群，重试不行，还是报相同的错；

4、把每个redis节点下面的rdb和aof都删除（如果是生产环境谨慎操作），重启redis集群，用jedis客户端代码也可以连接了，没有抛异常；

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