gistfile1.txt

% git diff
diff --git a/ceilometer/storage/impl_mongodb.py b/ceilometer/storage/impl_mongodb.py
index 4580833..84bd8fc 100644
--- a/ceilometer/storage/impl_mongodb.py
+++ b/ceilometer/storage/impl_mongodb.py
@@ -288,6 +288,8 @@ class Connection(base.Connection):
             self.db.clear()
         else:
             self.conn.drop_database(self.db)
+            import time
+            time.sleep(5)
 
     @staticmethod
     def _parse_connection_url(url):