3 files changed, 18 insertions, 5 deletions
diff --git a/synapse/push/emailpusher.py b/synapse/push/emailpusher.py
index b7ea4438e0..28bd8ab748 100644
--- a/synapse/push/emailpusher.py
+++ b/synapse/push/emailpusher.py
@@ -91,7 +91,7 @@ class EmailPusher:
                 pass
             self.timed_call = None
 
-    def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
+    def on_new_notifications(self, max_stream_ordering):
         if self.max_stream_ordering:
             self.max_stream_ordering = max(
                 max_stream_ordering, self.max_stream_ordering
diff --git a/synapse/push/httppusher.py b/synapse/push/httppusher.py
index f21fa9b659..26706bf3e1 100644
--- a/synapse/push/httppusher.py
+++ b/synapse/push/httppusher.py
@@ -114,7 +114,7 @@ class HttpPusher:
         if should_check_for_notifs:
             self._start_processing()
 
-    def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
+    def on_new_notifications(self, max_stream_ordering):
         self.max_stream_ordering = max(
             max_stream_ordering, self.max_stream_ordering or 0
         )
diff --git a/synapse/push/pusherpool.py b/synapse/push/pusherpool.py
index 3c3262a88c..fa8473bf8d 100644
--- a/synapse/push/pusherpool.py
+++ b/synapse/push/pusherpool.py
@@ -64,6 +64,12 @@ class PusherPool:
         self._pusher_shard_config = hs.config.push.pusher_shard_config
         self._instance_name = hs.get_instance_name()
 
+        # Record the last stream ID that we were poked about so we can get
+        # changes since then. We set this to the current max stream ID on
+        # startup as every individual pusher will have checked for changes on
+        # startup.
+        self._last_room_stream_id_seen = self.store.get_room_max_stream_ordering()
+
         # map from user id to app_id:pushkey to pusher
         self.pushers = {}  # type: Dict[str, Dict[str, Union[HttpPusher, EmailPusher]]]
 
@@ -178,20 +184,27 @@ class PusherPool:
                 )
                 await self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])
 
-    async def on_new_notifications(self, min_stream_id, max_stream_id):
+    async def on_new_notifications(self, max_stream_id):
         if not self.pushers:
             # nothing to do here.
             return
 
+        if max_stream_id < self._last_room_stream_id_seen:
+            # Nothing to do
+            return
+
+        prev_stream_id = self._last_room_stream_id_seen
+        self._last_room_stream_id_seen = max_stream_id
+
         try:
             users_affected = await self.store.get_push_action_users_in_range(
-                min_stream_id, max_stream_id
+                prev_stream_id, max_stream_id
             )
 
             for u in users_affected:
                 if u in self.pushers:
                     for p in self.pushers[u].values():
-                        p.on_new_notifications(min_stream_id, max_stream_id)
+                        p.on_new_notifications(max_stream_id)
 
         except Exception:
             logger.exception("Exception in pusher on_new_notifications")