redis:

    cluster:

      nodes: 192.168.x.x:7101,192.168.x.x:7102,192.168.x.x:7103,1192.168.x.x:7101,192.168.x.x:7102,......

  max-redirects: 30

    password: xxxx

    timeout: 15s

    lettuce:

      pool:

        max-active: 50

        max-idle: 10

        min-idle: 3

192.168.x.x:7001 (3ec8ae28...) -> 119943618 keys | 2731 slots | 1 slaves.

192.168.x.x:7006 (64dfc290...) -> 119828403 keys | 2731 slots | 1 slaves.

192.168.x.x:7003 (4b4701bd...) -> 117518202 keys | 2730 slots | 1 slaves.

192.168.x.x:7004 (018d6328...) -> 117563400 keys | 2730 slots | 1 slaves.

192.168.x.x:7005 (94c3a6c8...) -> 119839657 keys | 2731 slots | 1 slaves.

192.168.x.x:7002 (921179ca...) -> 120069963 keys | 2731 slots | 1 slaves.

[OK] 714763243 keys in 6 masters.

43625.69 keys per slot on average.

问题现象：

      redis5.0.3本身好象有bug,当发生主节点coredump时，cluster集群自动完成主备节点的切换，此时SpringBoot2开发的应用无法继续操作redis,不停地报错。

问题原因：

      SpringBoot2默认配置时，redis连接池用的是Lettuce的连接工厂，默认情况下，没有起用拓扑刷新，当redis集群发生主备切换时，集群的拓扑已经发生改变，Lettuce连接工厂连的还是还是原来的主用节点，肯定报异常

解决办法：

    public static LettucePoolingClientConfiguration getLettuceClusterPoolingConfig(Integer maxActive, Integer maxIdle, Integer minIdle, Duration timeout){

        GenericObjectPoolConfig genericObjectPoolConfig=getGenericObjectPoolConfig(maxActive, maxIdle, minIdle);

        ClusterTopologyRefreshOptions clusterTopologyRefreshOptions = ClusterTopologyRefreshOptions.builder()

        ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder().validateClusterNodeMembership(false)

                .topologyRefreshOptions(clusterTopologyRefreshOptions).build();

        LettucePoolingClientConfiguration poolingClientConfiguration=LettucePoolingClientConfiguration.builder()

                .poolConfig(genericObjectPoolConfig)

                .clientOptions(clusterClientOptions)

                .commandTimeout(timeout)

                .build();

        return poolingClientConfiguration;

    }

    public static RedisConnectionFactory getLettuceClusterConnectionFactory(List nodes, String password,

                                                                            Integer maxActive, Integer maxIdle, Integer minIdle, Duration timeout){

        LettucePoolingClientConfiguration clientConfiguration=getLettuceClusterPoolingConfig(maxActive,maxIdle,minIdle,timeout);

        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration(nodes);

        redisClusterConfiguration.setPassword(RedisPassword.of(password));

        return new LettuceConnectionFactory(redisClusterConfiguration,clientConfiguration);

    }