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-rw-r--r--synapse/federation/sender/per_destination_queue.py22
-rw-r--r--synapse/handlers/message.py4
2 files changed, 23 insertions, 3 deletions
diff --git a/synapse/federation/sender/per_destination_queue.py b/synapse/federation/sender/per_destination_queue.py
index dd150f89a6..8cbc23d901 100644
--- a/synapse/federation/sender/per_destination_queue.py
+++ b/synapse/federation/sender/per_destination_queue.py
@@ -337,6 +337,28 @@ class PerDestinationQueue(object):
                     (e.retry_last_ts + e.retry_interval) / 1000.0
                 ),
             )
+
+            if e.retry_interval > 60 * 60 * 1000:
+                # we won't retry for another hour!
+                # (this suggests a significant outage)
+                # We drop pending PDUs and EDUs because otherwise they will
+                # rack up indefinitely.
+                # Note that:
+                # - the EDUs that are being dropped here are those that we can
+                #   afford to drop (specifically, only typing notifications,
+                #   read receipts and presence updates are being dropped here)
+                # - Other EDUs such as to_device messages are queued with a
+                #   different mechanism
+                # - this is all volatile state that would be lost if the
+                #   federation sender restarted anyway
+
+                # dropping read receipts is a bit sad but should be solved
+                # through another mechanism, because this is all volatile!
+                self._pending_pdus = []
+                self._pending_edus = []
+                self._pending_edus_keyed = {}
+                self._pending_presence = {}
+                self._pending_rrs = {}
         except FederationDeniedError as e:
             logger.info(e)
         except HttpResponseException as e:
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 2643438e84..48b0fc7279 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -891,9 +891,7 @@ class EventCreationHandler(object):
         except Exception:
             # Ensure that we actually remove the entries in the push actions
             # staging area, if we calculated them.
-            run_in_background(
-                self.store.remove_push_actions_from_staging, event.event_id
-            )
+            await self.store.remove_push_actions_from_staging(event.event_id)
             raise
 
     async def _validate_canonical_alias(