Umair Khan 0e8231d0f1 process_queue: Recover gracefully after PostgreSQL restart. ...

- For threaded workers:
Django's autoreloader catches SIGQUIT(3) to reload the program. If
a process being watched by autoreloader exits with status code 3,
reloader will restart the process. To reload, we send SIGUSR1(10)
signal from consumers to a handler in process_queue which then
exits with status code 3.

- For single worker per process:
Catch the SIGUSR1 and quit; supervisorctl will restart the worker
automatically.

Fixes #5512

2017-07-07 16:33:15 -07:00

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