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-rw-r--r--synapse/replication/slave/storage/events.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/replication/slave/storage/events.py b/synapse/replication/slave/storage/events.py
index 7ba7a6f6e4..635febb174 100644
--- a/synapse/replication/slave/storage/events.py
+++ b/synapse/replication/slave/storage/events.py
@@ -146,12 +146,14 @@ class SlavedEventStore(BaseSlavedStore):
 
         stream = result.get("forward_ex_outliers")
         if stream:
+            self._stream_id_gen.advance(stream["position"])
             for row in stream["rows"]:
                 event_id = row[1]
                 self._invalidate_get_event_cache(event_id)
 
         stream = result.get("backward_ex_outliers")
         if stream:
+            self._backfill_id_gen.advance(-stream["position"])
             for row in stream["rows"]:
                 event_id = row[1]
                 self._invalidate_get_event_cache(event_id)