spring數據redis主從配置

Question

以下是我的 jedis 配置

@Bean
public JedisConnectionFactory getJedisConnectionFactory() {
    JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();
    jedisConnectionFactory.setUsePool(true);
    return jedisConnectionFactory;
}

@Bean
public RedisTemplate<String, Object> getRedisTemplate() {
    RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
    redisTemplate.setConnectionFactory(getJedisConnectionFactory());
    return redisTemplate;
}

當我有單個服務器時，此配置運行良好。 我想要做的是有 1 個 redis master 和多個 redis slave。 根據 redis 文檔，讀取應該從奴隸發生，寫入應該發生在主人身上。 如何更改上述配置以使用 master 進行寫入和使用 slave 進行讀取？

假設我的主人在 192.168.10.10 而奴隸在本地主機。

謝謝！

Answer 1

目前，Spring Data Redis 中沒有配置選項可以啟用所需的行為。 Jedis本身也不為這種場景提供支持（請參閱jedis #458 ）。 RedisConnection在執行操作時向工廠請求連接。 此時請求的資源的使用目的尚不清楚，因為命令可能是r 、 w或rw 。

一種潛在的解決方案是自定義RedisConnectionFactory能夠提供連接 - 到您擁有的一個從站 - 在執行只讀命令的情況下。

SlaveAwareJedisConnectionFactory factory = new SlaveAwareJedisConnectionFactory();
factory.afterPropertiesSet();

RedisConnection connection = factory.getConnection();

// writes to master
connection.set("foo".getBytes(), "bar".getBytes());

// reads from slave
connection.get("foo".getBytes());

/**
 * SlaveAwareJedisConnectionFactory wraps JedisConnection with a proy that delegates readonly commands to slaves.
 */
class SlaveAwareJedisConnectionFactory extends JedisConnectionFactory {

  /**
    * Get a proxied connection to Redis capable of sending
    * readonly commands to a slave node
    */
  public JedisConnection getConnection() {

    JedisConnection c = super.getConnection();

    ProxyFactory proxyFactory = new ProxyFactory(c);
    proxyFactory.addAdvice(new ConnectionSplittingInterceptor(this));
    proxyFactory.setProxyTargetClass(true);

    return JedisConnection.class.cast(proxyFactory.getProxy());
  };

  /**
   * This one will get the connection to one of the slaves to read from there
   * 
   * @return
   */
  public RedisConnection getSlaveConnection() {

    //TODO: find the an available slave serving the data
    return new JedisConnection(new Jedis("your slave host lookup here"));
  }

  static class ConnectionSplittingInterceptor implements MethodInterceptor,
      org.springframework.cglib.proxy.MethodInterceptor {

    private final SlaveAwareJedisConnectionFactory factory;

    public ConnectionSplittingInterceptor(SlaveAwareJedisConnectionFactory factory) {
      this.factory = factory;
    }

    @Override
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {

      RedisCommand commandToExecute = RedisCommand.failsafeCommandLookup(method.getName());

      if (!commandToExecute.isReadonly()) {
        return invoke(method, obj, args);
      }

      RedisConnection connection = factory.getSlaveConnection();

      try {
        return invoke(method, connection, args);
      } finally {
        // properly close the connection after executing command
        if (!connection.isClosed()) {
          connection.close();
        }
      }
    }

    private Object invoke(Method method, Object target, Object[] args) throws Throwable {

      try {
        return method.invoke(target, args);
      } catch (InvocationTargetException e) {
        throw e.getCause();
      }
    }

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
      return intercept(invocation.getThis(), invocation.getMethod(), invocation.getArguments(), null);
    }
  }
}

上面的解決方案包含幾個問題。 例如。 您的應用程序中的MULTI EXEC塊可能不再按預期工作，因為命令現在可能會被傳送到您不希望它們出現的地方。 所以也許有多個RedisTemplates用於專用的讀、寫目的也是有意義的。

Answer 2

您應該使用Redis Sentinel來保持 redis 的主/從配置...您可以使用下面的連接到哨兵池-

@Bean
public RedisConnectionFactory jedisConnectionFactory() {
RedisSentinelConfiguration sentinelConfig = new RedisSentinelConfiguration() .master("mymaster")
    .sentinel("127.0.0.1", 26379) .sentinel("127.0.0.1", 26380);
return new JedisConnectionFactory(sentinelConfig);
}

參考： Spring Sentinel 支持

Answer 3

你想要寫到主從從

這是如何使用 sentinal 集群和 spring-boot 配置它

spring:
  data:
    redis:
      sentinel: 
        master: mymaster
        nodes: my.sentinel.hostname1:26379,my.sentinel.hostname2:26379
      port: 6379

和彈簧配置

@Configuration
public class RedisDatasourceConfig {

  @Bean
  public LettuceClientConfigurationBuilderCustomizer lettuceClientConfigurationBuilderCustomizer() {
    return p -> p.readFrom(SLAVE_PREFERRED);
  }
}

Answer 4

主/從架構的復制與 Sentinel 不同。

設置redis只讀副本非常簡單。

我的 Spring Boot 應用程序 yaml。

redis:
  master:
    host: localhost
    port: 6379
  slaves:
    - host: localhost
      port: 16379
    - host: localhost
      port: 26379

對於上述實例，應更新 slaves 實例 redis 配置，如下所示。

################################# REPLICATION #################################

# Master-Replica replication. Use replicaof to make a Redis instance a copy of
# another Redis server. A few things to understand ASAP about Redis replication.
#
#   +------------------+      +---------------+
#   |      Master      | ---> |    Replica    |
#   | (receive writes) |      |  (exact copy) |
#   +------------------+      +---------------+
#
# 1) Redis replication is asynchronous, but you can configure a master to
#    stop accepting writes if it appears to be not connected with at least
#    a given number of replicas.
# 2) Redis replicas are able to perform a partial resynchronization with the
#    master if the replication link is lost for a relatively small amount of
#    time. You may want to configure the replication backlog size (see the next
#    sections of this file) with a sensible value depending on your needs.
# 3) Replication is automatic and does not need user intervention. After a
#    network partition replicas automatically try to reconnect to masters
#    and resynchronize with them.
#
replicaof master 6379

在此處查看 docker 設置。

https://www.vinsguru.com/redis-master-slave-with-spring-boot/