文章目录
- 连接单机
- mvn
- YML
- Controller.java
- RedisConfig.java
- 连接集群
- YML
- 问题复现
RedisTemplate方式
连接单机
mvn
<!--Redis-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>your version</version>
</dependency>
YML
server.port=5000
# Redis数据库索引(默认为0)
spring.redis.database=1
# Redis服务器地址
spring.redis.host=192.168.1.122
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码(默认为空)
spring.redis.password=
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
Controller.java
@Slf4j
@RestController
public class RedisController {
@Resource
RedisTemplate<String,Object> redisTemplate;
@Autowired
WebApplicationContext webContext;
@GetMapping("/t1")
public String t1(String k){
return redisTemplate.opsForValue().get(k).toString();
}
@GetMapping("/t2")
public String t2(){
return "t2";
}
@GetMapping("/t3")
public String t3() {
return "t3";
}
@GetMapping( "/t4")
public void getAllUrl() {
}
}
RedisConfig.java
@Configuration
public class RedisConfig
{
/**
* redis序列化的工具配置类,下面这个请一定开启配置
* 127.0.0.1:6379> keys *
* 1) "ord:102" 序列化过
* 2) "\xac\xed\x00\x05t\x00\aord:102" 野生,没有序列化过
* this.redisTemplate.opsForValue(); //提供了操作string类型的所有方法
* this.redisTemplate.opsForList(); // 提供了操作list类型的所有方法
* this.redisTemplate.opsForSet(); //提供了操作set的所有方法
* this.redisTemplate.opsForHash(); //提供了操作hash表的所有方法
* this.redisTemplate.opsForZSet(); //提供了操作zset的所有方法
* @param lettuceConnectionFactory
* @return
*/
@Bean
public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory)
{
RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();
redisTemplate.setConnectionFactory(lettuceConnectionFactory);
//设置key序列化方式string
redisTemplate.setKeySerializer(new StringRedisSerializer());
//设置value的序列化方式json,使用GenericJackson2JsonRedisSerializer替换默认序列化
redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
redisTemplate.setHashKeySerializer(new StringRedisSerializer());
redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
redisTemplate.afterPropertiesSet();
return redisTemplate;
}
}
连接集群
YML
# 存在问题
# ========================redis集群=====================
spring.redis.password=123456
# 获取失败 最大重定向次数
spring.redis.cluster.max-redirects=3
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
spring.redis.cluster.nodes=192.168.111.175:6381,192.168.111.175:6382,192.168.111.172:6383,192.168.111.172:6384,192.168.111.174:6385,192.168.111.174:6386
# ========================redis集群=====================
spring.redis.password=111111
# 获取失败 最大重定向次数
spring.redis.cluster.max-redirects=3
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
#支持集群拓扑动态感应刷新,自适应拓扑刷新是否使用所有可用的更新,默认false关闭
spring.redis.lettuce.cluster.refresh.adaptive=true
#定时刷新
spring.redis.lettuce.cluster.refresh.period=2000
spring.redis.cluster.nodes=192.168.111.175:6381,192.168.111.175:6382,192.168.111.172:6383,192.168.111.172:6384,192.168.111.174:6385,192.168.111.174:6386
问题复现
人为模拟,master-6381机器意外容机,手动shutdown
先对rédis集群命令方式,手动验证各种读写命令,看看6384是否上位
Redis Clùster集群能自动感知并自动完成主备切换,对应的slave6384会被选举为新的master节点
SpringBoot客户端没有动态感知到RedisCluster的最新集群信息
SpringBoot 2.X版本,Redis默认的连接池采用 lettuce当Redis 集群节点发生变化后,letture默认是不会刷新节点拓扑
解决方案
-
排除lettuce采用jedis(不推荐)
-
重写连接工厂实例(极度不推荐)
//仅做参考,不写,不写,不写。
@Bean
public DefaultClientResources lettuceClientResources() {
return DefaultClientResources.create();
}
@Bean
public LettuceConnectionFactory lettuceConnectionFactory(RedisProperties redisProperties, ClientResources clientResources) {
ClusterTopologyRefreshOptions topologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
.enablePeriodicRefresh(Duration.ofSeconds(30)) //按照周期刷新拓扑
.enableAllAdaptiveRefreshTriggers() //根据事件刷新拓扑
.build();
ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
//redis命令超时时间,超时后才会使用新的拓扑信息重新建立连接
.timeoutOptions(TimeoutOptions.enabled(Duration.ofSeconds(10)))
.topologyRefreshOptions(topologyRefreshOptions)
.build();
LettuceClientConfiguration clientConfiguration = LettuceClientConfiguration.builder()
.clientResources(clientResources)
.clientOptions(clusterClientOptions)
.build();
RedisClusterConfiguration clusterConfig = new RedisClusterConfiguration(redisProperties.getCluster().getNodes());
clusterConfig.setMaxRedirects(redisProperties.getCluster().getMaxRedirects());
clusterConfig.setPassword(RedisPassword.of(redisProperties.getPassword()));
LettuceConnectionFactory lettuceConnectionFactory = new LettuceConnectionFactory(clusterConfig, clientConfiguration);
return lettuceConnectionFactory;
}
- 刷新节点集群拓扑动态感应
https://github.com/lettuce-io/lettuce-core/wiki/Redis-Cluster#user-content-refreshing-the-cluster-topology-view
改写yml
# ========================redis集群=====================
spring.redis.password=111111
# 获取失败 最大重定向次数
spring.redis.cluster.max-redirects=3
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
#支持集群拓扑动态感应刷新,自适应拓扑刷新是否使用所有可用的更新,默认false关闭
spring.redis.lettuce.cluster.refresh.adaptive=true
#定时刷新
spring.redis.lettuce.cluster.refresh.period=2000
spring.redis.cluster.nodes=192.168.111.175:6381,192.168.111.175:6382,192.168.111.172:6383,192.168.111.172:6384,192.168.111.174:6385,192.168.111.174:6386