Don't send the full event json over replication

2 files changed, 16 insertions, 30 deletions

diff --git a/synapse/replication/resource.py b/synapse/replication/resource.py
index d8eb14592b..03930fe958 100644
--- a/synapse/replication/resource.py
+++ b/synapse/replication/resource.py
@@ -283,12 +283,12 @@ class ReplicationResource(Resource):
 
             if request_events != upto_events_token:
                 writer.write_header_and_rows("events", res.new_forward_events, (
-                    "position", "internal", "json", "state_group"
+                    "position", "event_id", "room_id", "type", "state_key",
                 ), position=upto_events_token)
 
             if request_backfill != upto_backfill_token:
                 writer.write_header_and_rows("backfill", res.new_backfill_events, (
-                    "position", "internal", "json", "state_group",
+                    "position", "event_id", "room_id", "type", "state_key", "redacts",
                 ), position=upto_backfill_token)
 
             writer.write_header_and_rows(
diff --git a/synapse/replication/slave/storage/events.py b/synapse/replication/slave/storage/events.py
index 518c9ea2e9..a513165a14 100644
--- a/synapse/replication/slave/storage/events.py
+++ b/synapse/replication/slave/storage/events.py
@@ -242,46 +242,32 @@ class SlavedEventStore(BaseSlavedStore):
         return super(SlavedEventStore, self).process_replication(result)
 
     def _process_replication_row(self, row, backfilled):
-        internal = json.loads(row[1])
-        event_json = json.loads(row[2])
-        event = FrozenEvent(event_json, internal_metadata_dict=internal)
+        stream_ordering = row[0] if not backfilled else -row[0]
         self.invalidate_caches_for_event(
-            event, backfilled,
+            stream_ordering, row[1], row[2], row[3], row[4], row[5],
+            backfilled=backfilled,
         )
 
-    def invalidate_caches_for_event(self, event, backfilled):
-        self._invalidate_get_event_cache(event.event_id)
+    def invalidate_caches_for_event(self, stream_ordering, event_id, room_id,
+                                    etype, state_key, redacts, backfilled):
+        self._invalidate_get_event_cache(event_id)
 
-        self.get_latest_event_ids_in_room.invalidate((event.room_id,))
+        self.get_latest_event_ids_in_room.invalidate((room_id,))
 
         self.get_unread_event_push_actions_by_room_for_user.invalidate_many(
-            (event.room_id,)
+            (room_id,)
         )
 
         if not backfilled:
             self._events_stream_cache.entity_has_changed(
-                event.room_id, event.internal_metadata.stream_ordering
+                room_id, stream_ordering
             )
 
-        # self.get_unread_event_push_actions_by_room_for_user.invalidate_many(
-        #     (event.room_id,)
-        # )
+        if redacts:
+            self._invalidate_get_event_cache(redacts)
 
-        if event.type == EventTypes.Redaction:
-            self._invalidate_get_event_cache(event.redacts)
-
-        if event.type == EventTypes.Member:
+        if etype == EventTypes.Member:
             self._membership_stream_cache.entity_has_changed(
-                event.state_key, event.internal_metadata.stream_ordering
+                state_key, stream_ordering
             )
-            self.get_invited_rooms_for_user.invalidate((event.state_key,))
-
-        if not event.is_state():
-            return
-
-        if backfilled:
-            return
-
-        if (not event.internal_metadata.is_invite_from_remote()
-                and event.internal_metadata.is_outlier()):
-            return
+            self.get_invited_rooms_for_user.invalidate((state_key,))