可能考虑使用更短的 maxLifetime 值 - hikari connection pool spring boot

Question

启动我的 SpringBoot 应用程序后，在服务器启动的几分钟内出现异常。没有在外部使用任何 HikariPool 配置，Spring Boot 默认使用 HikariPool 这是我在控制台中遇到的错误：

 2020-02-20 03:16:23 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@4c4180c8 (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:28 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@679c2f50 (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:33 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@16083061 (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:38 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@4fcaf421 (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:43 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@33df5d54 (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:48 - HikariPool-4 - Failed to validate connection
com.mysql.cj.jdbc.ConnectionImpl@373d288c (No operations allowed after connection closed.).
Possibly consider using a shorter maxLifetime value.
2020-02-20 03:16:48 - SQL Error: 0, SQLState: 08003
2020-02-20 03:16:48 - HikariPool-4 - Connection is not available, request timed out after
30156ms.
2020-02-20 03:16:48 - No operations allowed after connection closed.
2020-02-20 03:16:48 - Servlet.service() for servlet [dispatcherServlet] in context with path
[] threw exception [Request processing failed; nested exception is
org.springframework.dao.DataAccessResourceFailureException: Unable to acquire JDBC
Connection; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to
acquire JDBC Connection] with root cause

原文由 Sanjog 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

问题是 spring.datasource.hikari.maxLifetime 属性的默认值（默认为 30 分钟， https://github.com/brettwoldridge/HikariCP#configuration-knobs-baby ）高于数据库的 wait_timeout ，我的情况是 10 分钟。

所以你有两个选择，要么将 hikari.maxLifetime 减少到 10 分钟以下，要么增加数据库的 wait_timeout 属性。

原文由 Karbert 发布，翻译遵循 CC BY-SA 4.0 许可协议