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Fix AssertionErrors after purging events (#11642)

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* Fix AssertionErrors after purging events

If you purged a bunch of events from your database, and then restarted synapse
without receiving more events, then you would get a bunch of AssertionErrors on
restart.

This fixes the situation by rewinding the stream processors.

* `check-newsfragment`: ignore deleted newsfiles
This commit is contained in:
Richard van der Hoff 2022-01-04 16:36:33 +00:00 • committed by GitHub
parent 878aa55293
commit b38bdae3a2
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6 changed files with 30 additions and 6 deletions
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11
synapse/handlers/stats.py
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@ -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