diff --git a/changelog.d/5920.bugfix b/changelog.d/5920.bugfix
new file mode 100644
index 0000000000..e45eb0ffee
--- /dev/null
+++ b/changelog.d/5920.bugfix
@@ -0,0 +1 @@
+Fix a cache-invalidation bug for worker-based deployments.
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
|
