内存泄漏将redis与生菜客户端连接时出错

Question

我正在使用生菜连接到redis:spring boot starter redis:2.0.6.RELEASE，当我启动应用程序时，会出现以下错误：

[ERROR][main][ResourceLeakDetector][error] - LEAK: 
HashedWheelTimer.release() was not called before it's garbage- 
collected. See http://netty.io/wiki/reference-counted-objects.html for 
more information.
Recent access records: 
Created at:
io.netty.util.HashedWheelTimer.<init>(HashedWheelTimer.java:272)
io.netty.util.HashedWheelTimer.<init>(HashedWheelTimer.java:216)
io.lettuce.core.resource.DefaultClientResources.<init>(DefaultClientResources.java:163)
io.lettuce.core.resource.DefaultClientResources$Builder.build(DefaultClientResources.java:461)
io.lettuce.core.resource.DefaultClientResources.create(DefaultClientResources.java:229)
io.lettuce.core.AbstractRedisClient.<init>(AbstractRedisClient.java:96)
io.lettuce.core.RedisClient.<init>(RedisClient.java:86)
io.lettuce.core.RedisClient.create(RedisClient.java:123)
org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.lambda$createClient$7(LettuceConnectionFactory.java:853)
java.util.Optional.orElseGet(Optional.java:267)
org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.createClient(LettuceConnectionFactory.java:853)
org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.afterPropertiesSet(LettuceConnectionFactory.java:232)

redis配置文件：

public class RedisConfig {
@Bean
RedisConnectionFactory lettuceConnectionFactory(RedisProperties 
redisProperties) {
// 
}
@Bean
public RedisTemplate<String, Object> 
redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
}
private RedisStandaloneConfiguration connection(RedisProperties 
redisProperties) {
}
}

config yaml文件：

spring:      
redis:
host: 
lettuce:
pool:
max-active:  100

有人帮忙吗？

Answer 1

如果在应用程序中使用多个RedisClient实例，则需要在它们之间共享ClientResources对象。

创建RedisClient的典型方法是：

RedisClient.create("someUrl");

但是，当您想要创建多个实例时，不建议使用这种创建对象的方式。RedisClient内部有一个带有重物的字段：ClientResources当您创建许多RedisClient实例时，运行时可能会产生错误

LEAK: You are creating too many HashedWheelTimer instances.  HashedWheelTimer is a shared resource that must be reused across the JVM,so that only a few instances are created.

您可以在应用程序中创建一个共享ClientResources。并将此对象传递给构造函数RedisClient。

例如：

ClientResources sharedResources = DefaultClientResources.create();
//and use this between many RedisClients i.e.:
RedisClient first = RedisClient.create(sharedResources, "someUrl");
RedisClient second = RedisClient.create(sharedResources, "someUrl_222");
RedisClient third = RedisClient.create(sharedResources, "someUrl_3333");

更多deatils，请访问这里

Answer 2

当创建多个RedisClient实例而不共享ClientResources时，通常会发生这种类型的错误。

Spring Boot创建了一个singleton实例，因此任何其他实例都可能是由您的代码或外部依赖项创建的。如果没有进一步的背景，就不可能说得更多。