add a metadata cache and re-compute ignore when deleting a course to speed up the whole thing as well as squelching warnings in the console output

cms/djangoapps/contentstore/management/commands/delete_course.py

@@ -9,12 +9,14 @@ from xmodule.course_module import CourseDescriptor
 from .prompt import query_yes_no
 
 from auth.authz import _delete_course_group
+from request_cache.middleware import RequestCache
+from django.core.cache import get_cache
 
 #
 # To run from command line: rake cms:delete_course LOC=MITx/111/Foo1
 #
 
-
+CACHE = get_cache('mongo_metadata_inheritance')
 class Command(BaseCommand):
     help = '''Delete a MongoDB backed course'''
 
@@ -22,7 +24,7 @@ class Command(BaseCommand):
         if len(args) != 1 and len(args) != 2:
             raise CommandError("delete_course requires one or more arguments: <location> |commit|")
 
-        loc_str = args[0]
+        course_id = args[0]
 
         commit = False
         if len(args) == 2:
@@ -34,9 +36,14 @@ class Command(BaseCommand):
         ms = modulestore('direct')
         cs = contentstore()
 
-        if query_yes_no("Deleting course {0}. Confirm?".format(loc_str), default="no"):
+        ms.metadata_inheritance_cache_subsystem = CACHE
+        ms.request_cache = RequestCache.get_request_cache()
+        org, course_num, run = course_id.split("/")
+        ms.ignore_write_events_on_courses.append('{0}/{1}'.format(org, course_num))
+
+        if query_yes_no("Deleting course {0}. Confirm?".format(course_id), default="no"):
             if query_yes_no("Are you sure. This action cannot be undone!", default="no"):
-                loc = CourseDescriptor.id_to_location(loc_str)
+                loc = CourseDescriptor.id_to_location(course_id)
                 if delete_course(ms, cs, loc, commit):
                     print 'removing User permissions from course....'
                     # in the django layer, we need to remove all the user permissions groups associated with this course