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[Bug 1742835] [NEW] Cache Location Parsing Error Multiple Memcache Servers

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Kenneth Peeples <1742835@xxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Jan 2018 01:14:42 -0000
Reply-to: Bug 1742835 <1742835@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

When trying to add 3 controllers for a HA environment in
local_settings.py in the LOCATION for MEMCACHED a parsing error is
received.  The documentation for Openstack indicates this is the current
way to provide failover.  The other openstack projects provide this.

local_settings.py

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': 'controller1:11211,controller2:11211,controller3:11211',
    },is the currrent}

ERROR in apache2.

[Thu Jan 11 20:01:03.499016 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] mod_wsgi (pid=9577): Exception occurred processing WSGI script '/usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi'.
[Thu Jan 11 20:01:03.499070 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] Traceback (most recent call last):
[Thu Jan 11 20:01:03.499095 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/http/response.py", line 309, in close
[Thu Jan 11 20:01:03.499156 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     signals.request_finished.send(sender=self._handler_class)
[Thu Jan 11 20:01:03.499169 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 189, in send
[Thu Jan 11 20:01:03.499187 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     response = receiver(signal=self, sender=sender, **named)
[Thu Jan 11 20:01:03.499196 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/__init__.py", line 156, in close_caches
[Thu Jan 11 20:01:03.499213 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     cache.close()
[Thu Jan 11 20:01:03.499224 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 111, in close
[Thu Jan 11 20:01:03.499240 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self._cache.disconnect_all()
[Thu Jan 11 20:01:03.499247 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 175, in _cache
[Thu Jan 11 20:01:03.499261 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self._client = self._lib.Client(self._servers, pickleProtocol=pickle.HIGHEST_PROTOCOL)
[Thu Jan 11 20:01:03.499270 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 223, in __init__
[Thu Jan 11 20:01:03.499284 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self.set_servers(servers)
[Thu Jan 11 20:01:03.499292 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 302, in set_servers
[Thu Jan 11 20:01:03.499305 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     for s in servers]
[Thu Jan 11 20:01:03.499314 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1321, in __init__
[Thu Jan 11 20:01:03.499326 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     raise ValueError('Unable to parse connection string: "%s"' % host)
[Thu Jan 11 20:01:03.499349 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] ValueError: Unable to parse connection string: "controller1:11211,controller2:11211,controller3:11211"

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1742835

Title:
  Cache Location Parsing Error Multiple Memcache Servers

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  When trying to add 3 controllers for a HA environment in
  local_settings.py in the LOCATION for MEMCACHED a parsing error is
  received.  The documentation for Openstack indicates this is the
  current way to provide failover.  The other openstack projects provide
  this.

  local_settings.py

  CACHES = {
      'default': {
          'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
          'LOCATION': 'controller1:11211,controller2:11211,controller3:11211',
      },is the currrent}

  ERROR in apache2.

  [Thu Jan 11 20:01:03.499016 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] mod_wsgi (pid=9577): Exception occurred processing WSGI script '/usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi'.
  [Thu Jan 11 20:01:03.499070 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] Traceback (most recent call last):
  [Thu Jan 11 20:01:03.499095 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/http/response.py", line 309, in close
  [Thu Jan 11 20:01:03.499156 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     signals.request_finished.send(sender=self._handler_class)
  [Thu Jan 11 20:01:03.499169 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 189, in send
  [Thu Jan 11 20:01:03.499187 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     response = receiver(signal=self, sender=sender, **named)
  [Thu Jan 11 20:01:03.499196 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/__init__.py", line 156, in close_caches
  [Thu Jan 11 20:01:03.499213 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     cache.close()
  [Thu Jan 11 20:01:03.499224 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 111, in close
  [Thu Jan 11 20:01:03.499240 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self._cache.disconnect_all()
  [Thu Jan 11 20:01:03.499247 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 175, in _cache
  [Thu Jan 11 20:01:03.499261 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self._client = self._lib.Client(self._servers, pickleProtocol=pickle.HIGHEST_PROTOCOL)
  [Thu Jan 11 20:01:03.499270 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 223, in __init__
  [Thu Jan 11 20:01:03.499284 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     self.set_servers(servers)
  [Thu Jan 11 20:01:03.499292 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 302, in set_servers
  [Thu Jan 11 20:01:03.499305 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     for s in servers]
  [Thu Jan 11 20:01:03.499314 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]   File "/usr/lib/python2.7/dist-packages/memcache.py", line 1321, in __init__
  [Thu Jan 11 20:01:03.499326 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087]     raise ValueError('Unable to parse connection string: "%s"' % host)
  [Thu Jan 11 20:01:03.499349 2018] [wsgi:error] [pid 9577:tid 139748597044992] [remote 10.11.0.2:38087] ValueError: Unable to parse connection string: "controller1:11211,controller2:11211,controller3:11211"

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Follow ups

[Bug 1742835] Re: Cache Location Parsing Error Multiple Memcache Servers
From: Akihiro Motoki, 2018-01-12