mojolicious - 如何解决催眠工作人员的故障

Question

我有一个由 Hypnotoad 提供的应用程序，没有反向代理。它有 15 个工作人员，每个允许 2 个客户端。该应用程序在前台模式下通过催眠启动。

我在 log/production.log 中看到以下内容:

[Wed Apr  1 16:28:12 2015] [error] Worker 119914 has no heartbeat, restarting.
[Wed Apr  1 16:28:21 2015] [error] Worker 119910 has no heartbeat, restarting.
[Wed Apr  1 16:28:21 2015] [error] Worker 119913 has no heartbeat, restarting.
[Wed Apr  1 16:28:22 2015] [error] Worker 119917 has no heartbeat, restarting.
[Wed Apr  1 16:28:22 2015] [error] Worker 119909 has no heartbeat, restarting.
[Wed Apr  1 16:28:27 2015] [error] Worker 119907 has no heartbeat, restarting.
[Wed Apr  1 16:28:34 2015] [error] Worker 119905 has no heartbeat, restarting.
[Wed Apr  1 16:28:42 2015] [error] Worker 119904 has no heartbeat, restarting.
[Wed Apr  1 16:30:12 2015] [error] Worker 119912 has no heartbeat, restarting.
[Wed Apr  1 16:31:23 2015] [error] Worker 119918 has no heartbeat, restarting.
[Wed Apr  1 16:32:18 2015] [error] Worker 119911 has no heartbeat, restarting.
[Wed Apr  1 16:32:22 2015] [error] Worker 119916 has no heartbeat, restarting.

但是， worker 永远不会重新启动。

当我运行 strace 时，管理器进程似乎勇敢地试图杀死(现已过期) worker :

Process 119878 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>) = 0
kill(119906, SIGKILL)                   = 0
kill(119917, SIGKILL)                   = 0
kill(119905, SIGKILL)                   = 0
kill(119910, SIGKILL)                   = 0
kill(119904, SIGKILL)                   = 0
kill(119914, SIGKILL)                   = 0
kill(119916, SIGKILL)                   = 0
kill(119908, SIGKILL)                   = 0
kill(119913, SIGKILL)                   = 0
kill(119915, SIGKILL)                   = 0
kill(119918, SIGKILL)                   = 0
kill(119912, SIGKILL)                   = 0
kill(119909, SIGKILL)                   = 0
kill(119911, SIGKILL)                   = 0
kill(119907, SIGKILL)                   = 0
stat("/xxx/xxx/xxx/hypnotoad.pid", {st_mode=S_IFREG|0644, st_size=6, ...}) = 0
poll([{fd=4, events=POLLIN|POLLPRI}], 1, 1000) = 0 (Timeout)
kill(119906, SIGKILL)                   = 0
kill(119917, SIGKILL)                   = 0
kill(119905, SIGKILL)                   = 0
kill(119910, SIGKILL)                   = 0
kill(119904, SIGKILL)                   = 0
kill(119914, SIGKILL)                   = 0
kill(119916, SIGKILL)                   = 0
kill(119908, SIGKILL)                   = 0
kill(119913, SIGKILL)                   = 0
kill(119915, SIGKILL)                   = 0
kill(119918, SIGKILL)                   = 0
kill(119912, SIGKILL)                   = 0
kill(119909, SIGKILL)                   = 0
kill(119911, SIGKILL)                   = 0
kill(119907, SIGKILL)                   = 0
stat("/xxx/xxx/xxx/hypnotoad.pid", {st_mode=S_IFREG|0644, st_size=6, ...}) = 0
poll([{fd=4, events=POLLIN|POLLPRI}], 1, 1000^C <unfinished ...>
Process 119878 detached

我怎样才能进一步解决这个问题以确定:

为什么催眠蟾​​蜍认为它仍然需要杀死不存在的
流程？

为什么不开始新的？

Answer 1

What does "Worker 31842 has no heartbeat, restarting" mean?

As long as they are accepting new connections, worker processes of all built-in preforking web servers send heartbeat messages to the manager process at regular intervals, to signal that they are still responsive. A blocking operation such as an infinite loop in your application can prevent this, and will force the affected worker to be restarted after a timeout. This timeout defaults to 20 seconds and can be extended with the attribute "heartbeat_timeout" in Mojo::Server::Prefork if your application requires it.

http://mojolicio.us/perldoc/Mojolicious/Guides/FAQ#What-does-Worker-31842-has-no-heartbeat-restarting-mean