连接未关闭（HikariCP、Postgres）

Question

环境

春季启动 2.1.2。

2 个环境：local（postgres 11）和qa（docker swarm with postgres 10 和应用程序）

问题

后maxLifetime传球，阿光重新创建连接（关闭旧的，创造新的），但对qa环境的连接没有得到关闭：与检查select * from pg_stat_activity wheredataname=... ，并在日志中，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

题：

为什么连接没有关闭？

编辑： Hikari 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)

Answer 1

通过设置maxLifetime为 10 分钟解决。

说明： 事实证明 docker swarm 以某种方式丢弃了空闲连接。所以，当 hikari 关闭连接时，没有任何东西到达 postgres，所以从 postgres 的角度来看，仍然存在连接。10 分钟比默认的 docker 空闲连接超时少，因此连接正确关闭。