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authorRichard van der Hoff <1389908+richvdh@users.noreply.github.com>2019-08-28 10:18:16 +0100
committerGitHub <noreply@github.com>2019-08-28 10:18:16 +0100
commit49ef8ec3995db4d14e1b1367c9cd96ea231072f4 (patch)
tree671097e8cdebb335c9e6c6335539e64fc1297d50 /synapse/storage
parentMerge pull request #5914 from matrix-org/rei/admin_getadmin (diff)
downloadsynapse-49ef8ec3995db4d14e1b1367c9cd96ea231072f4.tar.xz
Fix a cache-invalidation bug for worker-based deployments (#5920)
Some of the caches on worker processes were not being correctly invalidated
when a room's state was changed in a way that did not affect the membership
list of the room.

We need to make sure we send out cache invalidations even when no memberships
are changing.
Diffstat (limited to 'synapse/storage')
-rw-r--r--synapse/storage/_base.py24
1 files changed, 16 insertions, 8 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 489ce82fae..abe16334ec 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -1395,14 +1395,22 @@ class SQLBaseStore(object):
         """
         txn.call_after(self._invalidate_state_caches, room_id, members_changed)
 
-        # We need to be careful that the size of the `members_changed` list
-        # isn't so large that it causes problems sending over replication, so we
-        # send them in chunks.
-        # Max line length is 16K, and max user ID length is 255, so 50 should
-        # be safe.
-        for chunk in batch_iter(members_changed, 50):
-            keys = itertools.chain([room_id], chunk)
-            self._send_invalidation_to_replication(txn, _CURRENT_STATE_CACHE_NAME, keys)
+        if members_changed:
+            # We need to be careful that the size of the `members_changed` list
+            # isn't so large that it causes problems sending over replication, so we
+            # send them in chunks.
+            # Max line length is 16K, and max user ID length is 255, so 50 should
+            # be safe.
+            for chunk in batch_iter(members_changed, 50):
+                keys = itertools.chain([room_id], chunk)
+                self._send_invalidation_to_replication(
+                    txn, _CURRENT_STATE_CACHE_NAME, keys
+                )
+        else:
+            # if no members changed, we still need to invalidate the other caches.
+            self._send_invalidation_to_replication(
+                txn, _CURRENT_STATE_CACHE_NAME, [room_id]
+            )
 
     def _invalidate_state_caches(self, room_id, members_changed):
         """Invalidates caches that are based on the current state, but does