播放：重新启动代码更改需要很长时间才能关闭并启动 Hikary Pool

Question

在使用 Play 时等待服务器重新启动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 需要很长时间（> 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。

配置如下：

sbt 1.2.8

线程池

我们使用应用程序的默认线程池。对于我们使用的数据库访问：

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 billoneil 在 Hikari Github Page 上的帮助和@Issilva 的建议，我可以解决问题：

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初始化无法访问的数据源。除了一个奇怪的异常关闭时间问题已解决（减少到毫秒）。

播放：重新启动代码更改需要很长时间才能关闭并启动 Hikary Pool

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

scala

playframework

hikaricp