2 files changed, 15 insertions, 1 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 7dc67ecd57..583b77a835 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -26,6 +26,10 @@ from twisted.internet import defer
 import sys
 import time
 import threading
+import os
+
+
+CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
 
 
 logger = logging.getLogger(__name__)
@@ -163,7 +167,9 @@ class SQLBaseStore(object):
         self._get_event_cache = Cache("*getEvent*", keylen=3, lru=True,
                                       max_entries=hs.config.event_cache_size)
 
-        self._state_group_cache = DictionaryCache("*stateGroupCache*", 2000)
+        self._state_group_cache = DictionaryCache(
+            "*stateGroupCache*", 2000 * CACHE_SIZE_FACTOR
+        )
 
         self._event_fetch_lock = threading.Condition()
         self._event_fetch_list = []
diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index 46ab38a313..9be977f387 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -77,6 +77,14 @@ class RoomStore(SQLBaseStore):
             allow_none=True,
         )
 
+    def set_room_is_public(self, room_id, is_public):
+        return self._simple_update_one(
+            table="rooms",
+            keyvalues={"room_id": room_id},
+            updatevalues={"is_public": is_public},
+            desc="set_room_is_public",
+        )
+
     def get_public_room_ids(self):
         return self._simple_select_onecol(
             table="rooms",