scala - Play : Restart on code change takes long to shutdown and starting the Hikary Pool

Question

使用 Play 时等待服务器重启花费了我们很多时间。
我在日志中看到的一件事是关闭和启动 HikaryPool 需要很多时间(> 40 秒)。

这是日志:

2019-10-31 09:11:47,327 [info] application - Shutting down connection pool.
2019-10-31 09:11:47,328 [info] c.z.h.HikariDataSource - HikariPool-58 - Shutdown initiated...
2019-10-31 09:11:53,629 [info] c.z.h.HikariDataSource - HikariPool-58 - Shutdown completed.
2019-10-31 09:11:53,629 [info] application - Shutting down connection pool.
2019-10-31 09:11:53,629 [info] c.z.h.HikariDataSource - HikariPool-59 - Shutdown initiated...
2019-10-31 09:11:53,636 [info] c.z.h.HikariDataSource - HikariPool-59 - Shutdown completed.
2019-10-31 09:11:53,636 [info] application - Shutting down connection pool.
2019-10-31 09:11:53,636 [info] c.z.h.HikariDataSource - HikariPool-60 - Shutdown initiated...
2019-10-31 09:11:53,640 [info] c.z.h.HikariDataSource - HikariPool-60 - Shutdown completed.
....
2019-10-31 09:12:26,454 [info] p.a.d.DefaultDBApi - Database [amseewen] initialized at jdbc:postgresql://localhost:5432/bpf?currentSchema=amseewen
2019-10-31 09:12:26,454 [info] application - Creating Pool for datasource 'amseewen'
2019-10-31 09:12:26,454 [info] c.z.h.HikariDataSource - HikariPool-68 - Starting...
2019-10-31 09:12:26,455 [info] c.z.h.HikariDataSource - HikariPool-68 - Start completed.
2019-10-31 09:12:26,455 [info] p.a.d.DefaultDBApi - Database [companyOds] initialized at jdbc:sqlserver://localhost:1433;databaseName=companyOds
2019-10-31 09:12:26,455 [info] application - Creating Pool for datasource 'companyOds'
2019-10-31 09:12:26,455 [info] c.z.h.HikariDataSource - HikariPool-69 - Starting...
2019-10-31 09:12:26,456 [info] c.z.h.HikariDataSource - HikariPool-69 - Start completed.
2019-10-31 09:12:26,457 [info] p.a.d.DefaultDBApi - Database [company] initialized at jdbc:oracle:thin:@castor.olymp:1521:citrin
2019-10-31 09:12:26,457 [info] application - Creating Pool for datasource 'company'
2019-10-31 09:12:26,457 [info] c.z.h.HikariDataSource - HikariPool-70 - Starting...
2019-10-31 09:12:26,458 [info] c.z.h.HikariDataSource - HikariPool-70 - Start completed.
2019-10-31 09:12:26,458 [info] p.a.d.DefaultDBApi - Database [amseewen] initialized at jdbc:postgresql://localhost:5432/bpf?currentSchema=amseewen
2019-10-31 09:12:26,458 [info] application - Creating Pool for datasource 'amseewen'
2019-10-31 09:12:26,458 [info] c.z.h.HikariDataSource - HikariPool-71 - Starting...
2019-10-31 09:12:26,459 [info] c.z.h.HikariDataSource - HikariPool-71 - Start completed.
2019-10-31 09:12:26,459 [info] p.a.d.DefaultDBApi - Database [companyOds] initialized at jdbc:sqlserver://localhost:1433;databaseName=companyOds
2019-10-31 09:12:26,459 [info] application - Creating Pool for datasource 'companyOds'
2019-10-31 09:12:26,459 [info] c.z.h.HikariDataSource - HikariPool-72 - Starting...
2019-10-31 09:12:26,459 [info] c.z.h.HikariDataSource - HikariPool-72 - Start completed.

有没有办法缩短这个时间？

更新

我使用 Intellij 的 Play 集成。构建工具是 sbt。

这是配置:



sbt 1.2.8

线程池

我们为应用程序使用默认线程池。对于数据库访问，我们使用:

database.dispatcher {
  executor = "thread-pool-executor"
  throughput = 1
  thread-pool-executor {
    fixed-pool-size = 55 # db conn pool (50) + number of cores (4) + housekeeping (1)
  }
}

Answer 1

好的，在 Hikari Github Page 上的 billoneil 的帮助下和@Issilva 的建议，我可以找出问题所在:

The problem are now datasources where the database is not reachable (during development). So we configured it, that the application also starts when the database is not reachable (initializationFailTimeout = -1).

So there are 2 problems when shutting down:

• The pools are shutdown sequentially.
• A pool that has no connection takes 10 seconds to shutdown.

建议的解决方案是不要初始化无法访问的数据源。除了一个奇怪的异常 关机时间问题解决 (低至毫秒)。