Jedis

Access a DCS Redis instance through Jedis on an ECS in the same VPC. For more information about how to use other Redis clients, visit the Redis official website.

Spring Data Redis is already integrated with Jedis and Lettuce for Spring Boot projects. Spring Boot 1.x is integrated with Jedis, and Spring Boot 2.x is integrated with Lettuce. To use Jedis in Spring Boot 2.x and later, you need to solve Lettuce dependency conflicts.

Prerequisites

• A DCS Redis instance has been created and is in the Running state.

• View the IP address/domain name and port number of the DCS Redis instance to be accessed.

  For details, see Viewing Details of a DCS Instance.

• An ECS has been created. For details about how to create an ECS, see the Elastic Cloud Server User Guide.

• If the ECS runs the Linux OS, ensure that the Java compilation environment has been installed on the ECS.

Pom Configuration

<!-- import spring-data-redis -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
<!--In Spring Boot 2.0, Lettuce is used by default. To use Jedis, solve dependency conflicts.-->
    <exclusions>
        <exclusion>
            <groupId>io.lettuce</groupId>
            <artifactId>lettuce-core</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!--Jedis dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.10.0</version>
</dependency>

application.properties Configuration

• Single-node, master/standby, and Proxy Cluster

  #Redis host
  spring.redis.host=<host>
  #Redis port
  spring.redis.port=<port>
  #Redis database number
  spring.redis.database=0
  #Redis password
  spring.redis.password=<password>
  #Redis read/write timeout
  spring.redis.timeout=2000
  #Whether to enable connection pooling
  spring.redis.jedis.pool.enabled=true
  #Minimum connections in the pool
  spring.redis.jedis.pool.min-idle=50
  #Maximum idle connections in the pool
  spring.redis.jedis.pool.max-idle=200
  #Maximum connections in the pool
  spring.redis.jedis.pool.max-active=200
  #Maximum amount of time a connection allocation should block before throwing an exception when the pool is exhausted. The default value -1 indicates to wait indefinitely.
  spring.redis.jedis.pool.max-wait=3000
  #Interval for checking and evicting idle connection. Default: 60s.
  spring.redis.jedis.pool.time-between-eviction-runs=60S
  

• Redis Cluster

  #Redis Cluster node connection information
  spring.redis.cluster.nodes=<ip:port>,<ip:port>,<ip:port>
  #Redis Cluster password
  spring.redis.password=<password>
  #Redis Cluster max. redirecting times
  spring.redis.cluster.max-redirects=3
  #Redis read/write timeout
  spring.redis.timeout=2000
  #Whether to enable connection pooling
  spring.redis.jedis.pool.enabled=true
  #Minimum connections in the pool
  spring.redis.jedis.pool.min-idle=50
  #Maximum idle connections in the pool
  spring.redis.jedis.pool.max-idle=200
  #Maximum connections in the pool
  spring.redis.jedis.pool.max-active=200
  #Maximum amount of time a connection allocation should block before throwing an exception when the pool is exhausted. The default value -1 indicates to wait indefinitely.
  spring.redis.jedis.pool.max-wait=3000
  #Interval for checking and evicting idle connections. Default: 60s.
  spring.redis.jedis.pool.time-between-eviction-runs=60S
  

Bean Configuration

• Single-node, master/standby, and Proxy Cluster

  import java.time.Duration;
  
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.data.redis.connection.RedisConnectionFactory;
  import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
  import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
  import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
  
  import redis.clients.jedis.JedisPoolConfig;
  
  @Configuration
  public class RedisConfiguration {
  
      @Value("${redis.host}")
      private String redisHost;
  
      @Value("${redis.port:6379}")
      private Integer redisPort = 6379;
  
      @Value("${redis.database:0}")
      private Integer redisDatabase = 0;
  
      @Value("${redis.password:}")
      private String redisPassword;
  
      @Value("${redis.connect.timeout:3000}")
      private Integer redisConnectTimeout = 3000;
  
      @Value("${redis.read.timeout:2000}")
      private Integer redisReadTimeout = 2000;
  
      @Value("${redis.pool.minSize:50}")
      private Integer redisPoolMinSize = 50;
  
      @Value("${redis.pool.maxSize:200}")
      private Integer redisPoolMaxSize = 200;
  
      @Value("${redis.pool.maxWaitMillis:3000}")
      private Integer redisPoolMaxWaitMillis = 3000;
  
      @Value("${redis.pool.softMinEvictableIdleTimeMillis:1800000}")
      private Integer redisPoolSoftMinEvictableIdleTimeMillis = 30 * 60 * 1000;
  
      @Value("${redis.pool.timeBetweenEvictionRunsMillis:60000}")
      private Integer redisPoolBetweenEvictionRunsMillis = 60 * 1000;
  
      @Bean
      public RedisConnectionFactory redisConnectionFactory(JedisClientConfiguration clientConfiguration) {
  
          RedisStandaloneConfiguration standaloneConfiguration = new RedisStandaloneConfiguration();
          standaloneConfiguration.setHostName(redisHost);
          standaloneConfiguration.setPort(redisPort);
          standaloneConfiguration.setDatabase(redisDatabase);
          standaloneConfiguration.setPassword(redisPassword);
  
          return new JedisConnectionFactory(standaloneConfiguration, clientConfiguration);
      }
  
      @Bean
      public JedisClientConfiguration clientConfiguration() {
  
          JedisClientConfiguration clientConfiguration = JedisClientConfiguration.builder()
                  .connectTimeout(Duration.ofMillis(redisConnectTimeout))
                  .readTimeout(Duration.ofMillis(redisReadTimeout))
                  .usePooling().poolConfig(redisPoolConfig())
                  .build();
  
          return clientConfiguration;
      }
  
      private JedisPoolConfig redisPoolConfig() {
  
          JedisPoolConfig poolConfig = new JedisPoolConfig();
          //Minimum connections in the pool
          poolConfig.setMinIdle(redisPoolMinSize);
          //Maximum idle connections in the pool
          poolConfig.setMaxIdle(redisPoolMaxSize);
          //Maximum total connections in the pool
          poolConfig.setMaxTotal(redisPoolMaxSize);
          //Wait when pool is exhausted? Set to true to wait. To validate setMaxWait, it has to be true.
          poolConfig.setBlockWhenExhausted(true);
          //Longest time to wait for connection after pool is exhausted. The default value -1 indicates to wait indefinitely.
          poolConfig.setMaxWaitMillis(redisPoolMaxWaitMillis);
          //Set to true to enable connectivity test on creating connections. Default: false.
          poolConfig.setTestOnCreate(false);
          //Set to true to enable connectivity test on borrowing connections. Default: false. Set to false for heavy-traffic services to reduce overhead.
          poolConfig.setTestOnBorrow(true);
          //Set to true to enable connectivity test on returning connections. Default: false. Set to false for heavy-traffic services to reduce overhead.
          poolConfig.setTestOnReturn(false);
          //Indicates whether to check for idle connections. If this is set to false, idle connections are not evicted.
          poolConfig.setTestWhileIdle(true);
          //Duration after which idle connections are evicted. If the idle duration is greater than this value and the maximum number of idle connections is reached, idle connections are directly evicted.
          poolConfig.setSoftMinEvictableIdleTimeMillis(redisPoolSoftMinEvictableIdleTimeMillis);
          //Disable MinEvictableIdleTimeMillis().
          poolConfig.setMinEvictableIdleTimeMillis(-1);
          //Interval for checking and evicting idle connections. Default: 60s.
          poolConfig.setTimeBetweenEvictionRunsMillis(redisPoolBetweenEvictionRunsMillis);
          return poolConfig;
      }
  }
  

• Redis Cluster

  import java.time.Duration;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.data.redis.connection.RedisClusterConfiguration;
  import org.springframework.data.redis.connection.RedisConnectionFactory;
  import org.springframework.data.redis.connection.RedisNode;
  import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
  import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
  
  import redis.clients.jedis.JedisPoolConfig;
  
  @Configuration
  public class RedisConfiguration {
  
      @Value("${redis.cluster.nodes}")
      private String redisClusterNodes;
  
      @Value("${redis.password:}")
      private String redisPassword;
  
      @Value("${redis.connect.timeout:3000}")
      private Integer redisConnectTimeout = 3000;
  
      @Value("${redis.read.timeout:2000}")
      private Integer redisReadTimeout = 2000;
  
      @Value("${redis.pool.minSize:50}")
      private Integer redisPoolMinSize = 50;
  
      @Value("${redis.pool.maxSize:200}")
      private Integer redisPoolMaxSize = 200;
  
      @Value("${redis.pool.maxWaitMillis:3000}")
      private Integer redisPoolMaxWaitMillis = 3000;
  
      @Value("${redis.pool.softMinEvictableIdleTimeMillis:1800000}")
      private Integer redisPoolSoftMinEvictableIdleTimeMillis = 30 * 60 * 1000;
  
      @Value("${redis.pool.timeBetweenEvictionRunsMillis:60000}")
      private Integer redisPoolBetweenEvictionRunsMillis = 60 * 1000;
  
      @Bean
      public RedisConnectionFactory redisConnectionFactory(JedisClientConfiguration clientConfiguration) {
  
          RedisClusterConfiguration clusterConfiguration = new RedisClusterConfiguration();
  
          List<RedisNode> clusterNodes = new ArrayList<>();
          for (String clusterNodeStr : redisClusterNodes.split(",")) {
              String[] nodeInfo = clusterNodeStr.split(":");
              clusterNodes.add(new RedisNode(nodeInfo[0], Integer.valueOf(nodeInfo[1])));
          }
          clusterConfiguration.setClusterNodes(clusterNodes);
  
          clusterConfiguration.setPassword(redisPassword);
          clusterConfiguration.setMaxRedirects(3);
  
          return new JedisConnectionFactory(clusterConfiguration, clientConfiguration);
      }
  
      @Bean
      public JedisClientConfiguration clientConfiguration() {
  
          JedisClientConfiguration clientConfiguration = JedisClientConfiguration.builder()
                  .connectTimeout(Duration.ofMillis(redisConnectTimeout))
                  .readTimeout(Duration.ofMillis(redisReadTimeout))
                  .usePooling().poolConfig(redisPoolConfig())
                  .build();
  
          return clientConfiguration;
      }
  
      private JedisPoolConfig redisPoolConfig() {
  
          JedisPoolConfig poolConfig = new JedisPoolConfig();
          //Minimum connections in the pool
          poolConfig.setMinIdle(redisPoolMinSize);
          //Maximum idle connections in the pool
          poolConfig.setMaxIdle(redisPoolMaxSize);
          //Maximum total connections in the pool
          poolConfig.setMaxTotal(redisPoolMaxSize);
          //Wait when pool is exhausted? Set to true to wait. To validate setMaxWait, it has to be true.
          poolConfig.setBlockWhenExhausted(true);
          //Longest time to wait for connection after pool is exhausted. The default value -1 indicates to wait indefinitely.
          poolConfig.setMaxWaitMillis(redisPoolMaxWaitMillis);
          //Set to true to enable connectivity test on creating connections. Default: false.
          poolConfig.setTestOnCreate(false);
          //Set to true to enable connectivity test on borrowing connections. Default: false. Set to false for heavy-traffic services to reduce overhead.
          poolConfig.setTestOnBorrow(true);
          //Set to true to enable connectivity test on returning connections. Default: false. Set to false for heavy-traffic services to reduce overhead.
          poolConfig.setTestOnReturn(false);
          //Indicates whether to check for idle connections. If this is set to false, idle connections are not evicted.
          poolConfig.setTestWhileIdle(true);
          //Duration after which idle connections are evicted. If the idle duration is greater than this value and the maximum number of idle connections is reached, idle connections are directly evicted.
          poolConfig.setSoftMinEvictableIdleTimeMillis(redisPoolSoftMinEvictableIdleTimeMillis);
          //Disable MinEvictableIdleTimeMillis().
          poolConfig.setMinEvictableIdleTimeMillis(-1);
          //Interval for checking and evicting idle connections. Default: 60s.
          poolConfig.setTimeBetweenEvictionRunsMillis(redisPoolBetweenEvictionRunsMillis);
          return poolConfig;
      }
  }
  

(Optional) Configuring SSL Connections

If SSL is enabled for the instance, use the following content to replace the JedisClientConfiguration construction method clientConfiguration() in Bean Configuration for connecting to the instance with SSL. For details about whether your DCS Redis instances support SSL, see Configuring SSL.

@Bean
public JedisClientConfiguration clientConfiguration() throws Exception {
    JedisClientConfiguration.JedisClientConfigurationBuilder configurationBuilder
        = JedisClientConfiguration.builder()
        .connectTimeout(Duration.ofMillis(redisConnectTimeout))
        .readTimeout(Duration.ofMillis(redisReadTimeout));

    configurationBuilder.usePooling().poolConfig(redisPoolConfig());
    configurationBuilder.useSsl().sslSocketFactory(getTrustStoreSslSocketFactory());
    return configurationBuilder.build();
}

private SSLSocketFactory getTrustStoreSslSocketFactory() throws Exception{
    //Load the CA certificate in the user-defined path based on service requirements.
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    Certificate ca;
    try (InputStream is = new FileInputStream("./ca.crt")) {
        ca = cf.generateCertificate(is);
    }

    //Create keystore.
    String keyStoreType = KeyStore.getDefaultType();
    KeyStore keyStore = KeyStore.getInstance(keyStoreType);
    keyStore.load(null, null);
    keyStore.setCertificateEntry("ca", ca);

    //Create TrustManager.
    TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
        TrustManagerFactory.getDefaultAlgorithm());
    trustManagerFactory.init(keyStore);

    //Create SSLContext.
    SSLContext context = SSLContext.getInstance("TLS");
    context.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
    return context.getSocketFactory();
}

Parameter Description

Table 1 RedisStandaloneConfiguration parameters

Parameter	Default Value	Description
hostName	localhost	IP address/domain name for connecting to a DCS Redis instance
port	6379	Port number
database	0	Database number. Default: 0.
password	-	Password

Table 2 RedisClusterConfiguration parameters

Parameter	Description
clusterNodes	Cluster node connection information, including the node IP address and port number
maxRedirects	Maximum redirecting times
password	Password

Table 3 JedisPoolConfig parameters

Parameter	Default Value	Description
minIdle	-	Minimum connections in the connection pool
maxIdle	-	Maximum idle connections in the connection pool
maxTotal	-	Maximum total connections in the connection pool
blockWhenExhausted	true	Indicates whether to wait after the connection pool is exhausted. true: Wait. false: Do not wait. To validate maxWaitMillis, this parameter must be set to true.
maxWaitMillis	-1	Maximum amount of time (in milliseconds) to wait for connection after the connection pool is exhausted. The default value -1 indicates to wait indefinitely.
testOnCreate	false	Indicates whether to enable connectivity test on creating connections. false: Disable. true: Enable.
testOnBorrow	false	Indicates whether to enable connectivity test on obtaining connections. false: Disable. true: Enable. For heavy-traffic services, set this parameter to false to reduce overhead.
testOnReturn	false	Indicates whether to enable connectivity test on returning connections. false: Disable. true: Enable. For heavy-traffic services, set this parameter to false to reduce overhead.
testWhileIdle	false	Indicates whether to check for idle connections. If this parameter is set to false, idle connections are not evicted. Recommended value: true.
softMinEvictableIdleTimeMillis	1800000	Duration (in milliseconds) after which idle connections are evicted. If the idle duration is greater than this value and the maximum number of idle connections is reached, idle connections are directly evicted.
minEvictableIdleTimeMillis	60000	Minimum amount of time (in milliseconds) a connection may remain idle in the pool before it is eligible for eviction. The recommended value is -1, indicating that softMinEvictableIdleTimeMillis is used instead.
timeBetweenEvictionRunsMillis	60000	Interval (in milliseconds) for checking and evicting idle connections.

Table 4 JedisClientConfiguration parameters

Parameter	Default Value	Description
connectTimeout	2000	Connection timeout interval, in milliseconds.
readTimeout	2000	Timeout interval for waiting for a response, in milliseconds.
poolConfig	-	Pool configurations. For details, see JedisPoolConfig.

Suggestion for Configuring DCS Instances

• Connection pool configuration

  Note

  The following calculation is applicable only to common service scenarios. You can customize it based on your service requirements.

  There is no standard connection pool size. You can configure one based on your service traffic. The following formulas are for reference:

  • Minimum number of connections = (QPS of a single node accessing Redis)/(1000 ms/Average time spent on a single command)

  • Maximum number of connections = (QPS of a single node accessing Redis)/(1000 ms/Average time spent on a single command) x 150%

  For example, if the QPS of a service application is about 10,000, each request needs to access Redis 10 times (that is, 100,000 accesses to Redis every second), and the service application has 10 hosts, the calculation is as follows:

  QPS of a single node accessing Redis = 100,000/10 = 10,000

  Average time spent on a single command = 20 ms (Redis takes 5 ms to 10 ms to process a single command under normal conditions. If network jitter occurs, it takes 15 ms to 20 ms.)

  Minimum number of connections = 10,000/(1000 ms/20 ms) = 200

  Maximum number of connections = 10,000/(1000 ms/20 ms) x 150% = 300

last updated: 2024-11-13 13:54 UTC - commit: 93bd43536502377606412af18143475372cf7df5