Question

当我使用springcloud zuul时，会发生大量的TCP CLOSE_WAIT状态，有人知道它为什么会发生吗？

这是我的zuul配置

父母pom

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath />
</parent>

pom.xml

<dependencies>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
</dependency>
       <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Edgware.SR2</version>
    <type>pom</type>
    <scope>import</scope>
   </dependency>
</dependencies>

application.properties

server.port=8081
spring.application.name=zuul-server-test
eureka.instance.preferIpAddress=true
eureka.instance.instance-id=${spring.cloud.client.ipAddress}:${server.port}
eureka.instance.leaseRenewalIntervalInSeconds=5
eureka.instance.leaseExpirationDurationInSeconds=10
eureka.client.serviceUrl.defaultZone=http://127.0.0.1:8080/eureka/

zuul.add-host-header=true
zuul.sensitive-headers=

hystrix.command.default.execution.timeout.enable=true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=60000
zuul.host.connect-timeout-millis=60000
zuul.host.socket-timeout-milllis=60000

ribbon.eureka.enabled=true
ribbon.ReadTimeout=60000
ribbon.ConnectTimeout=30000
ribbon.MaxAutoRetries=0
ribbon.MaxAutoRetriesNextServer=1
ribbon.OkToRetryOnAllOperations=false
ribbon.httpclient.enabled=false
ribbon.okhttp.enabled=true

zuul.routes.hello.path=/hello/**
zuul.routes.hello.sensitiveHeaders=
zuul.routes.hello.service-id=hello-server

java

    @SpringBootApplication
    @EnableDiscoveryClient
    @EnableZuulProxy
    public class DevcloudZuulApplication {
        public static void main(String[] args) {
            SpringApplication.run(DevcloudZuulApplication.class, args);
        }
    }

当我访问http://localhost:8081/hello/index.html时，创建了tcp链接，端口8082是hello服务器

    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21505 ESTABLISHED 47968/java          
    tcp        0      0 ::ffff:192.168.120.20:21505 ::ffff:192.168.120.20:8082 ESTABLISHED 132689/java         
    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21510 ESTABLISHED 47968/java  
    tcp        0      0 ::ffff:192.168.120.20:21510 ::ffff:192.168.120.20:8082 ESTABLISHED 132689/java        
    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21504 ESTABLISHED 47968/java          
    tcp        0      0 ::ffff:192.168.120.20:21504 ::ffff:192.168.120.20:8082 ESTABLISHED 132689/java

然后它改变

    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21505 FIN_WAIT2   -                   
    tcp        1      0 ::ffff:192.168.120.20:21505 ::ffff:192.168.120.20:8082 CLOSE_WAIT  132689/java         
    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21510 FIN_WAIT2    -        
    tcp        0      0 ::ffff:192.168.120.20:21510 ::ffff:192.168.120.20:8082 CLOSE_WAIT 132689/java 
    tcp        0      0 ::ffff:192.168.120.20:8082 ::ffff:192.168.120.20:21504 FIN_WAIT2   -                   
    tcp        1      0 ::ffff:192.168.120.20:21504 ::ffff:192.168.120.20:8082 CLOSE_WAIT  132689/java

最后

    tcp        1      0 ::ffff:192.168.120.20:21505 ::ffff:192.168.120.20:8082 CLOSE_WAIT  132689/java         
    tcp        1      0 ::ffff:192.168.120.20:21504 ::ffff:192.168.120.20:8082 CLOSE_WAIT  132689/java         
    tcp        1      0 ::ffff:192.168.120.20:21510 ::ffff:192.168.120.20:8082 CLOSE_WAIT  132689/java

，此状态将持续几个小时。

Answer 1

CLOSE_WAIT在这里描述：TCP connection status

此端点已收到来自远程端点的关闭请求，并且此TCP现在正在等待来自本地应用程序的连接终止请求。

Ribbon使用连接池将请求发送到上游。每次，它都会释放连接而不是关闭连接，以避免建立新连接的开销。

通过配置ribbon.PoolKeepAliveTime（默认值为15 * 60秒），池中的连接将保持活动状态。

public class DefaultClientConfigImpl implements IClientConfig {
    public static final long DEFAULT_POOL_KEEP_ALIVE_TIME = 15 * 60L;
    public static final TimeUnit DEFAULT_POOL_KEEP_ALIVE_TIME_UNITS = TimeUnit.SECONDS;
}


public class OkHttpRibbonConfiguration {
@Value("${ribbon.client.name}")
private String name = "client";

@Configuration
protected static class OkHttpClientConfiguration {
    private OkHttpClient httpClient;

    @Bean
    @ConditionalOnMissingBean(ConnectionPool.class)
    public ConnectionPool httpClientConnectionPool(IClientConfig config, OkHttpClientConnectionPoolFactory connectionPoolFactory) {
        Integer maxTotalConnections = config.getPropertyAsInteger(
                CommonClientConfigKey.MaxTotalConnections,
                DefaultClientConfigImpl.DEFAULT_MAX_TOTAL_CONNECTIONS);
        Object timeToLiveObj = config
                .getProperty(CommonClientConfigKey.PoolKeepAliveTime);
        Long timeToLive = DefaultClientConfigImpl.DEFAULT_POOL_KEEP_ALIVE_TIME;
        Object ttlUnitObj = config
                .getProperty(CommonClientConfigKey.PoolKeepAliveTimeUnits);
        TimeUnit ttlUnit = DefaultClientConfigImpl.DEFAULT_POOL_KEEP_ALIVE_TIME_UNITS;
        if (timeToLiveObj instanceof Long) {
            timeToLive = (Long) timeToLiveObj;
        }
        if (ttlUnitObj instanceof TimeUnit) {
            ttlUnit = (TimeUnit) ttlUnitObj;
        }
        return connectionPoolFactory.create(maxTotalConnections, timeToLive, ttlUnit);
    }

}

使用zuul会发生大量的CLOSE_WAIT

1 个答案: