From b16eca0be2179a49e45510ddde48698d7aa181bb Mon Sep 17 00:00:00 2001
From: Will Thompson <will@willthompson.co.uk>
Date: Wed, 16 Mar 2016 15:55:05 +0000
Subject: [PATCH] init: restart celery workers on 'reload' (fixes #2904)

Sending HUP to the parent of a family of celery workers causes the
parent to re-exec itself, spawning a new set of child workers without
terminating the old ones.

So instead we send TERM to the parent on 'reload', which cleans up the
children, and rely on systemd/upstart to respawn the whole family.
---
 etc/init/pandora-encoding.conf       | 1 +
 etc/init/pandora-tasks.conf          | 1 +
 etc/systemd/pandora-encoding.service | 2 +-
 etc/systemd/pandora-tasks.service    | 2 +-
 4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/etc/init/pandora-encoding.conf b/etc/init/pandora-encoding.conf
index e960373..1720297 100644
--- a/etc/init/pandora-encoding.conf
+++ b/etc/init/pandora-encoding.conf
@@ -7,6 +7,7 @@ start on runlevel [2345]
 stop on runlevel [!2345]
 
 respawn
+reload signal TERM
 
 env VENV=/srv/pandora
 env USER=pandora
diff --git a/etc/init/pandora-tasks.conf b/etc/init/pandora-tasks.conf
index 77882f0..7dc002c 100644
--- a/etc/init/pandora-tasks.conf
+++ b/etc/init/pandora-tasks.conf
@@ -7,6 +7,7 @@ start on runlevel [2345]
 stop on runlevel [!2345]
 
 respawn
+reload signal TERM
 
 env VENV=/srv/pandora
 env USER=pandora
diff --git a/etc/systemd/pandora-encoding.service b/etc/systemd/pandora-encoding.service
index 3b2cec0..a8e3c09 100644
--- a/etc/systemd/pandora-encoding.service
+++ b/etc/systemd/pandora-encoding.service
@@ -15,7 +15,7 @@ ExecStart=/srv/pandora/bin/python /srv/pandora/pandora/manage.py \
     -Q encoding -n pandora-encoding \
     --pidfile /run/pandora/encoding.pid \
     -l INFO
-ExecReload=/bin/kill -HUP $MAINPID
+ExecReload=/bin/kill -TERM $MAINPID
 
 [Install]
 WantedBy=multi-user.target
diff --git a/etc/systemd/pandora-tasks.service b/etc/systemd/pandora-tasks.service
index 494b372..3bb4ffa 100644
--- a/etc/systemd/pandora-tasks.service
+++ b/etc/systemd/pandora-tasks.service
@@ -15,7 +15,7 @@ ExecStart=/srv/pandora/bin/python /srv/pandora/pandora/manage.py \
     -Q default,celery -n pandora-default \
     --pidfile /run/pandora/tasks.pid \
     -l INFO
-ExecReload=/bin/kill -HUP $MAINPID
+ExecReload=/bin/kill -TERM $MAINPID
 
 [Install]
 WantedBy=multi-user.target
-- 
2.5.0