未关闭的连接（HikariCP、Postgres）
Connections not being closed(HikariCP, Postgres)
环境
Spring 启动 2.1.2。
2 种环境：local(postgres 11) 和 qa（docker 包含 postgres 10 和应用程序）
问题
在 maxLifetime 通过后，hikari 重新创建连接（关闭旧连接并创建新连接），但是在 qa 环境连接没有关闭：检查 select * from pg_stat_activity wheredataname=...
在日志中我们有：
2019-09-25 12:00:20.694 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@54d41592: (connection has passed maxLifetime)
2019-09-25 12:00:20.699 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@29e14ddb
2019-09-25 12:00:26.372 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@11684c62: (connection has passed maxLifetime)
2019-09-25 12:00:26.376 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@453f8d6c
2019-09-25 12:00:28.130 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@1b2ef2bc: (connection has passed maxLifetime)
2019-09-25 12:00:28.135 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4bf86bbb
2019-09-25 12:00:28.459 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@34fbeadd: (connection has passed maxLifetime)
2019-09-25 12:00:28.464 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4fc7e61c
2019-09-25 12:00:31.962 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@40771fc4: (connection has passed maxLifetime)
2019-09-25 12:00:31.966 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@ac56180
2019-09-25 12:00:35.600 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@65cae248: (connection has passed maxLifetime)
2019-09-25 12:00:35.607 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@33a8d959
2019-09-25 12:00:35.649 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@15e91fa9 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.650 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@11d699cc (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.651 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@3883b6a6 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.652 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@230234a5 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@15e91fa9: (connection is dead)
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@11d699cc: (connection is dead)
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@3883b6a6: (connection is dead)
2019-09-25 12:00:35.658 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@230234a5: (connection is dead)
2019-09-25 12:00:35.674 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@3b85c924
2019-09-25 12:00:35.678 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4b022f4e
2019-09-25 12:00:35.686 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@6aea9ecf
2019-09-25 12:00:35.691 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@1ffdf0da
问题：
为什么连接没有关闭？
编辑：
光配置：
c.z.h.HikariConfig : HikariPool-1 - configuration:
c.z.h.HikariConfig : allowPoolSuspension.............false
c.z.h.HikariConfig : autoCommit......................true
c.z.h.HikariConfig : catalog.........................none
c.z.h.HikariConfig : connectionInitSql...............none
c.z.h.HikariConfig : connectionTestQuery.............none
c.z.h.HikariConfig : connectionTimeout...............30000
c.z.h.HikariConfig : dataSource......................none
c.z.h.HikariConfig : dataSourceClassName.............none
c.z.h.HikariConfig : dataSourceJNDI..................none
c.z.h.HikariConfig : dataSourceProperties............{password=<masked>}
c.z.h.HikariConfig : driverClassName................."org.postgresql.Driver"
c.z.h.HikariConfig : healthCheckProperties...........{}
c.z.h.HikariConfig : healthCheckRegistry.............none
c.z.h.HikariConfig : idleTimeout.....................600000
c.z.h.HikariConfig : initializationFailTimeout.......1
c.z.h.HikariConfig : isolateInternalQueries..........false
c.z.h.HikariConfig : jdbcUrl.........................jdbc:postgresql://postgres/db
c.z.h.HikariConfig : leakDetectionThreshold..........0
c.z.h.HikariConfig : maxLifetime.....................1800000
c.z.h.HikariConfig : maximumPoolSize.................10
c.z.h.HikariConfig : metricRegistry..................none
c.z.h.HikariConfig : metricsTrackerFactory...........none
c.z.h.HikariConfig : minimumIdle.....................10
c.z.h.HikariConfig : password........................<masked>
c.z.h.HikariConfig : poolName........................"HikariPool-1"
c.z.h.HikariConfig : readOnly........................false
c.z.h.HikariConfig : registerMbeans..................false
c.z.h.HikariConfig : scheduledExecutor...............none
c.z.h.HikariConfig : schema..........................none
c.z.h.HikariConfig : threadFactory...................internal
c.z.h.HikariConfig : transactionIsolation............default
c.z.h.HikariConfig : username........................"username"
c.z.h.HikariConfig : validationTimeout...............5000
c.z.h.HikariDataSource : HikariPool-1 - Starting...
c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@53fd0d10
c.z.h.HikariDataSource : HikariPool-1 - Start completed.
o.f.c.i.d.DatabaseFactory : Database: jdbc:postgresql://postgres/db (PostgreSQL 10.10)
通过将 maxLifetime 设置为 10 分钟解决。
解释：
事实证明 docker swarm 以某种方式断开了空闲连接。因此，当 hikari 关闭连接时，没有任何东西到达 postgres，因此从 postgres 的角度来看，仍然存在连接。 10 分钟少于默认 docker 空闲连接超时，因此连接已正确关闭。
环境
Spring 启动 2.1.2。
2 种环境：local(postgres 11) 和 qa（docker 包含 postgres 10 和应用程序）
问题
在 maxLifetime 通过后，hikari 重新创建连接（关闭旧连接并创建新连接），但是在 qa 环境连接没有关闭：检查 select * from pg_stat_activity wheredataname=...
在日志中我们有：
2019-09-25 12:00:20.694 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@54d41592: (connection has passed maxLifetime)
2019-09-25 12:00:20.699 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@29e14ddb
2019-09-25 12:00:26.372 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@11684c62: (connection has passed maxLifetime)
2019-09-25 12:00:26.376 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@453f8d6c
2019-09-25 12:00:28.130 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@1b2ef2bc: (connection has passed maxLifetime)
2019-09-25 12:00:28.135 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4bf86bbb
2019-09-25 12:00:28.459 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@34fbeadd: (connection has passed maxLifetime)
2019-09-25 12:00:28.464 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4fc7e61c
2019-09-25 12:00:31.962 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@40771fc4: (connection has passed maxLifetime)
2019-09-25 12:00:31.966 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@ac56180
2019-09-25 12:00:35.600 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@65cae248: (connection has passed maxLifetime)
2019-09-25 12:00:35.607 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@33a8d959
2019-09-25 12:00:35.649 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@15e91fa9 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.650 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@11d699cc (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.651 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@3883b6a6 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.652 WARN 6 --- [ scheduling-1] c.z.h.p.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection@230234a5 (This connection has been closed.). Possibly consider using a shorter maxLifetime value.
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@15e91fa9: (connection is dead)
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@11d699cc: (connection is dead)
2019-09-25 12:00:35.657 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@3883b6a6: (connection is dead)
2019-09-25 12:00:35.658 DEBUG 6 --- [nnection closer] c.z.h.p.PoolBase : HikariPool-1 - Closing connection org.postgresql.jdbc.PgConnection@230234a5: (connection is dead)
2019-09-25 12:00:35.674 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@3b85c924
2019-09-25 12:00:35.678 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@4b022f4e
2019-09-25 12:00:35.686 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@6aea9ecf
2019-09-25 12:00:35.691 DEBUG 6 --- [onnection adder] c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@1ffdf0da
问题：
为什么连接没有关闭？
编辑： 光配置：
c.z.h.HikariConfig : HikariPool-1 - configuration:
c.z.h.HikariConfig : allowPoolSuspension.............false
c.z.h.HikariConfig : autoCommit......................true
c.z.h.HikariConfig : catalog.........................none
c.z.h.HikariConfig : connectionInitSql...............none
c.z.h.HikariConfig : connectionTestQuery.............none
c.z.h.HikariConfig : connectionTimeout...............30000
c.z.h.HikariConfig : dataSource......................none
c.z.h.HikariConfig : dataSourceClassName.............none
c.z.h.HikariConfig : dataSourceJNDI..................none
c.z.h.HikariConfig : dataSourceProperties............{password=<masked>}
c.z.h.HikariConfig : driverClassName................."org.postgresql.Driver"
c.z.h.HikariConfig : healthCheckProperties...........{}
c.z.h.HikariConfig : healthCheckRegistry.............none
c.z.h.HikariConfig : idleTimeout.....................600000
c.z.h.HikariConfig : initializationFailTimeout.......1
c.z.h.HikariConfig : isolateInternalQueries..........false
c.z.h.HikariConfig : jdbcUrl.........................jdbc:postgresql://postgres/db
c.z.h.HikariConfig : leakDetectionThreshold..........0
c.z.h.HikariConfig : maxLifetime.....................1800000
c.z.h.HikariConfig : maximumPoolSize.................10
c.z.h.HikariConfig : metricRegistry..................none
c.z.h.HikariConfig : metricsTrackerFactory...........none
c.z.h.HikariConfig : minimumIdle.....................10
c.z.h.HikariConfig : password........................<masked>
c.z.h.HikariConfig : poolName........................"HikariPool-1"
c.z.h.HikariConfig : readOnly........................false
c.z.h.HikariConfig : registerMbeans..................false
c.z.h.HikariConfig : scheduledExecutor...............none
c.z.h.HikariConfig : schema..........................none
c.z.h.HikariConfig : threadFactory...................internal
c.z.h.HikariConfig : transactionIsolation............default
c.z.h.HikariConfig : username........................"username"
c.z.h.HikariConfig : validationTimeout...............5000
c.z.h.HikariDataSource : HikariPool-1 - Starting...
c.z.h.p.HikariPool : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@53fd0d10
c.z.h.HikariDataSource : HikariPool-1 - Start completed.
o.f.c.i.d.DatabaseFactory : Database: jdbc:postgresql://postgres/db (PostgreSQL 10.10)
通过将 maxLifetime 设置为 10 分钟解决。
解释： 事实证明 docker swarm 以某种方式断开了空闲连接。因此，当 hikari 关闭连接时，没有任何东西到达 postgres，因此从 postgres 的角度来看，仍然存在连接。 10 分钟少于默认 docker 空闲连接超时，因此连接已正确关闭。