Redis 集群 - 从站不进行故障转移答案

【问题标题】：Redis Cluster - Slave does not FAILOVERRedis 集群 - 从站不进行故障转移
【发布时间】：2017-10-09 19:54:02
【问题描述】：

我已经创建了一个 Redis 集群，如下所示。

xxx.xxx.xxx.195:9100    xxx.xxx.xxx.196:9100    xxx.xxx.xxx.197:9100
xxx.xxx.xxx.195:9200    xxx.xxx.xxx.196:9200    xxx.xxx.xxx.197:9200

我经历过当我同时停止 2 个作为集群主控的 Redis 实例作为（xxx.xxx.xxx.196 的 2 个实例）时，集群无法恢复，

xxx.xxx.xxx.195:9100 (Master)    xxx.xxx.xxx.196:9100 (Master)   xxx.xxx.xxx.197:9100 (Slave)
xxx.xxx.xxx.195:9200 (Slave)     xxx.xxx.xxx.196:9200 (Master)   xxx.xxx.xxx.197:9200 (Slave)

但同时，如果我停止 2 个 .195 服务器实例，其中 9100 -Master 和 9200 - Slave。集群恢复正常

集群配置文件：

protected-mode no
activerehashing yes
cluster-enabled yes
cluster-config-file /opt/redis/conf/nodes9100.conf
cluster-slave-validity-factor 0
cluster-node-timeout 5000
appendonly yes

Redis 登录专用从服务器：

28939:S 09 Oct 16:08:32.834 - 0 clients connected (0 slaves), 1327200 bytes in use
28939:S 09 Oct 16:08:32.834 * Connecting to MASTER xxx.xxx.xxx.196:9200
28939:S 09 Oct 16:08:32.835 * MASTER <-> SLAVE sync started
28939:S 09 Oct 16:08:32.835 # Error condition on socket for SYNC: Connection refused
28939:S 09 Oct 16:08:33.837 * Connecting to MASTER xxx.xxx.xxx.196:9200
28939:S 09 Oct 16:08:33.837 * MASTER <-> SLAVE sync started
28939:S 09 Oct 16:08:33.837 # Error condition on socket for SYNC: Connection refused
28939:S 09 Oct 16:08:34.839 * Connecting to MASTER xxx.xxx.xxx.196:9200
28939:S 09 Oct 16:08:34.839 * MASTER <-> SLAVE sync started
28939:S 09 Oct 16:08:34.839 # Error condition on socket for SYNC: Connection refused
28939:S 09 Oct 16:08:35.840 * Connecting to MASTER xxx.xxx.xxx.196:9200
28939:S 09 Oct 16:08:35.840 * MASTER <-> SLAVE sync started
28939:S 09 Oct 16:08:35.840 # Error condition on socket for SYNC: Connection refused
28939:S 09 Oct 16:08:36.744 - Node 982d9b0a50b393d5fe604caefc0acaae68547648 reported node b57d59fb5685daeaac7e249d99fa257e9be66f4f as not reachable.
28939:S 09 Oct 16:08:36.844 * Connecting to MASTER xxx.xxx.xxx.196:9200
28939:S 09 Oct 16:08:36.844 * MASTER <-> SLAVE sync started
28939:S 09 Oct 16:08:36.844 # Error condition on socket for SYNC: Connection refused

【问题讨论】：

标签： redis redis-cluster

【解决方案1】：

发现问题：
源代码：https://redis.io/topics/cluster-tutorial Redis Cluster 还在分区期间提供了一定程度的可用性，这实际上是在某些节点发生故障或无法通信时继续操作的能力。但是，如果发生较大故障（例如，大多数主节点不可用），集群将停止运行。

【讨论】：