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Restart Django and Tornado separately from the other worker processes

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The amount of process downtime during a supervisord-mediated restart
appears to be linear in the number of processes that are being
restarted.  Therefore, restarting just Django and Tornado causes less
downtime than doing them at the same time as the other worker
processes.

(imported from commit 1fa9ef547bcd88caeec49800664e37d5f2fcb7a8)
This commit is contained in:
Zev Benjamin 2013-05-21 15:21:53 -04:00
parent 5e64b9e90b
commit 8fd72a09bc
2 changed files with 11 additions and 4 deletions
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7
servers/puppet/modules/humbug/files/supervisord/conf.d/humbug.conf
View File

@ -103,8 +103,11 @@ directory=/home/humbug/humbug/
; create one or more 'real' group: sections to create "heterogeneous"
; process groups.
[group:humbug]
programs=humbug-django-fcgi,humbug-tornado,humbug-events-user-activity,humbug-events-subscribe-new-users,humbug-events-confirmation-emails,humbug-events-missedmessage_reminders ; each refers to 'x' in [program:x] definitions
[group:humbug-web]
programs=humbug-django-fcgi,humbug-tornado ; each refers to 'x' in [program:x] definitions
[group:humbug-workers]
programs=humbug-events-user-activity,humbug-events-subscribe-new-users,humbug-events-confirmation-emails,humbug-events-missedmessage_reminders ; each refers to 'x' in [program:x] definitions
; The [include] section can just contain the "files" setting. This
; setting can list multiple files (separated by whitespace or

8
tools/restart-server
View File

@ -21,9 +21,13 @@ os.chdir("/home/humbug/humbug-deployments/current")
# Send a statsd event on restarting the server
subprocess.check_call(["python", "./manage.py", "send_stats", "incr", "events.server_restart", str(int(time.time()))])
# Restart the FastCGI and related processes via supervisorctl
# Restart the FastCGI and related processes via supervisorctl. We
# minimize downtime by restarting Django and Tornado separately from
# the other worker processes.
logging.info("Killing daemons")
subprocess.check_call(["supervisorctl", "restart", "humbug:*"])
subprocess.check_call(["supervisorctl", "stop", "humbug-workers:*"])
subprocess.check_call(["supervisorctl", "restart", "humbug-web:*"])
subprocess.check_call(["supervisorctl", "start", "humbug-workers:*"])
logging.info("Flushing memcached")
try: