1 files changed, 11 insertions, 0 deletions
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index bd3e6f2ec7..29e41a4c79 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -80,6 +80,17 @@ class StatsHandler:
# If self.pos is None then means we haven't fetched it from DB
if self.pos is None:
self.pos = await self.store.get_stats_positions()
+ room_max_stream_ordering = self.store.get_room_max_stream_ordering()
+ if self.pos > room_max_stream_ordering:
+ # apparently, we've processed more events than exist in the database!
+ # this can happen if events are removed with history purge or similar.
+ logger.warning(
+ "Event stream ordering appears to have gone backwards (%i -> %i): "
+ "rewinding stats processor",
+ self.pos,
+ room_max_stream_ordering,
+ )
+ self.pos = room_max_stream_ordering
# Loop round handling deltas until we're up to date
|
