我只是想在一个小案例应用程序中简化我的问题。
似乎在 Thread 完成之前 Connection 不会关闭。 Check this out
依赖信息:
Servlet 引擎:Apache Tomcat/8.5.5
JPA 提供程序:Hibernate
我的 pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>...</groupId>
<artifactId>***-service</artifactId>
<version>0.0.1</version>
<packaging>jar</packaging>
<name>...</name>
<description>...</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring.cloud.release.version>Brixton.SR2</spring.cloud.release.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- eureka discovery client -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- for unit tests -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- for rest documentation -->
<dependency>
<groupId>org.springframework.restdocs</groupId>
<artifactId>spring-restdocs-mockmvc</artifactId>
<scope>test</scope>
</dependency>
<!-- for (un)marshalling of json / xml -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
</dependency>
<dependency>
<!-- jsoup HTML parser library @ http://jsoup.org/ -->
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.9.2</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<!-- also needed for eureka discovery -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring.cloud.release.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>${artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<executable>true</executable>
<outputDirectory>${dir}</outputDirectory>
</configuration>
</plugin>
</plugins>
</build>
</project>
我有一个以 MYSQL 作为数据库的 Spring Boot 服务器。当我对超过 100 个线程/用户进行负载测试 (JMeter) 时，出现此异常:
org.apache.tomcat.jdbc.pool.PoolExhaustedException: [http-nio-8015-exec-195] Timeout: Pool empty. Unable to fetch a connection in 60 seconds, none available[size:50; busy:50; idle:0; lastwait:60000].
我的数据源配置:
spring.datasource.tomcat.minIdle = 0
spring.datasource.tomcat.maxIdle = 10
spring.datasource.tomcat.maxActive = 50
spring.datasource.tomcat.maxWait = 60000
spring.datasource.tomcat.testOnBorrow = true
spring.datasource.tomcat.timeBetweenEvictionRunsMillis = 1800000 // Updated
spring.datasource.tomcat.numTestsPerEvictionRun = 50 // Updated
spring.datasource.tomcat.minEvictableIdleTimeMillis = 10
spring.datasource.tomcat.validationQuery = SELECT 1
spring.datasource.tomcat.testWhileIdle = true
对数据库的唯一查询是一个简单的 SELECT * FROM TABLE WHERE deletedat IS NULL。它在大约 0.01 秒内返回大约 4000 个条目(通过 mysql CLI)。
我已经安装了 Neor Profile SQL 来分析我的 MYSQL 数据库。当我检查所有进程时，我的 Schema 上的进程都在 hibernate 。似乎我的配置没有释放那些连接。
我正在使用一个从 CrudRepository 扩展而来的简单接口(interface):
public interface MyRepository extends CrudRepository<MyModel, String> {
@Query("SELECT m from MyModel m WHERE m.deletedAt IS NULL")
List<MyModel> findWhereDeletedAtIsNull();
}
并使用它
List<MyModel> myModelList = myRepository.findWhereDeletedAtIsNull();
我错过了什么？
似乎需要修改 Configuration 或 Code 才能释放连接。
hibernate 配置:
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
最佳答案
注册 OpenEntityManagerInViewInterceptor 的 jpa 配置将 JPA EntityManager 绑定(bind)到工作线程以进行整个请求处理。因此，在服务方法 (com.example.api.UserService.getAllUser()) 完成后，数据库连接将关闭(或返回到池中)。
这会使您的数据库连接打开更长时间，并且您的连接池会在加载期间耗尽。
要解决您的问题，您可以通过添加 below property 来禁用 OpenEntityManagerInViewInterceptor 过滤器的自动注册在你的 application.properties
spring.jpa.open-in-view=false
此属性默认为真。
查看相关问题:
1. Consider not registering OpenEntityManagerInViewInterceptor by default
关于java - Spring 数据库负载测试 : How to release connections，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41218851/