Location map uses a separate cache and defaults to general

cms/djangoapps/auth/authz.py

@@ -203,8 +203,7 @@ def remove_user_from_course_group(caller, user, location, role):
 
     # see if the user is actually in that role, if not then we don't have to do anything
     groupnames, _ = get_all_course_role_groupnames(location, role)
-    for group in user.groups.filter(name__in=groupnames):
-        user.groups.remove(group)
+    user.groups.remove(*user.groups.filter(name__in=groupnames))
     user.save()
 
 

cms/envs/dev.py

@@ -129,7 +129,12 @@ CACHES = {
         'LOCATION': '/var/tmp/mongo_metadata_inheritance',
         'TIMEOUT': 300,
         'KEY_FUNCTION': 'util.memcache.safe_key',
-    }
+    },
+    'loc_cache': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'edx_location_mem_cache',
+    },
+
 }
 
 # Make the keyedcache startup warnings go away

cms/envs/test.py

@@ -138,7 +138,12 @@ CACHES = {
         'LOCATION': '/var/tmp/mongo_metadata_inheritance',
         'TIMEOUT': 300,
         'KEY_FUNCTION': 'util.memcache.safe_key',
-    }
+    },
+    'loc_cache': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'edx_location_mem_cache',
+    },
+
 }
 
 # hide ratelimit warnings while running tests

common/lib/xmodule/xmodule/modulestore/django.py

@@ -129,8 +129,12 @@ def loc_mapper():
     global _loc_singleton
     # pylint: disable=W0212
     if _loc_singleton is None:
+        try:
+            loc_cache = get_cache('loc_cache')
+        except InvalidCacheBackendError:
+            loc_cache = get_cache('default')
         # instantiate
-        _loc_singleton = LocMapperStore(get_cache('default'), **settings.DOC_STORE_CONFIG)
+        _loc_singleton = LocMapperStore(loc_cache, **settings.DOC_STORE_CONFIG)
     # inject into split mongo modulestore
     if 'split' in _MODULESTORES:
         _MODULESTORES['split'].loc_mapper = _loc_singleton

lms/envs/dev.py

@@ -85,7 +85,11 @@ CACHES = {
         'LOCATION': '/var/tmp/mongo_metadata_inheritance',
         'TIMEOUT': 300,
         'KEY_FUNCTION': 'util.memcache.safe_key',
-    }
+    },
+    'loc_cache': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'edx_location_mem_cache',
+    },
 }
 
 

lms/envs/test.py

@@ -165,7 +165,12 @@ CACHES = {
         'LOCATION': '/var/tmp/mongo_metadata_inheritance',
         'TIMEOUT': 300,
         'KEY_FUNCTION': 'util.memcache.safe_key',
-    }
+    },
+    'loc_cache': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'edx_location_mem_cache',
+    },
+
 }
 
 # Dummy secret key for dev