add some TODOs

synapse/handlers/federation_event.py

@@ -704,6 +704,8 @@ async def _process_pulled_event(
 
         try:
             state = await self._resolve_state_at_missing_prevs(origin, event)
+            # TODO(faster_joins): make sure that _resolve_state_at_missing_prevs does
+            #   not return partial state
             await self._process_received_pdu(
                 origin, event, state=state, backfilled=backfilled
             )

synapse/handlers/message.py

@@ -992,6 +992,8 @@ async def create_new_client_event(
             and full_state_ids_at_event
             and builder.internal_metadata.is_historical()
         ):
+            # TODO(faster_joins): figure out how this works, and make sure that the
+            #   old state is complete.
             old_state = await self.store.get_events_as_list(full_state_ids_at_event)
             context = await self.state.compute_event_context(event, old_state=old_state)
         else: