On Feb 28, 2017, at 8:11 AM, Роман Мещеряков <romanmescheryakov@yandex.ru> wrote:

Hello everyone,

today I tried restarting twisted service using sys.execv, and it fails with the following message:

 

> 2017-02-28T18:39:47+0300 [ready_to_setup#debug] Before os.execv: sys.executable is /usr/bin/python and sys.argv are ['/usr/local/bin/twistd', '-ny', 'master_player.tac']

> Another twistd server is running, PID 1939

 

> 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.

 

My service is started in the following way:

 

PYTHONPATH=. twistd -ny master_player.tac

 

(i.e. without daemonization)

Code to restart is:

 

> d = task.deferLater(self._reactor, seconds,

>                     shared_code.restart_script, self._log, self._reactor)

> # _restart_script_done should never be called

> d.addCallback(self._restart_script_done).addErrback(self._restart_script_failure)

 

where shared_code.restart_script is:

 

> def restart_script(logger, reactor):

>     logger.info("Restarting script...")

>     reactor.stop()

>     sys.stdout.flush()

>     #TODO: force logging system to flush all log files

>     logger.debug("Before os.execv: sys.executable is {sysexec} and sys.argv are {argv}",

>                 sysexec = sys.executable, argv = sys.argv)

>     os.execv(sys.executable, [sys.executable] + sys.argv)

 

Could someone explain to me why does the "Another twistd server is running" error occur and how can I avoid it?