[Twisted-Python] My twisted application could not start after reboot be cause of "twistd.pid"

[Peter Cai]

Someone turn off the server by cutting power of the server.
When the machine is power on, I found my twisted application could not start
and emit the following error.

Another twistd server is running, PID 3398

This could either be a previously started instance of your application or a
different application entirely. To start a new one, either run it in some
other
directory, or use the --pidfile and --logfile parameters to avoid clashes.

After I deleted twistd.pid, it could start normally.

I checked if there is process with PID 3398, but there wasn't.

What might cause this problem?  How to avoid it?

--
look to the things around you,the immediate world around you, if you are
alive,it will mean something to you ——Paul Strand
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