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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