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authorRichard van der Hoff <1389908+richvdh@users.noreply.github.com>2019-10-10 11:29:01 +0100
committerGitHub <noreply@github.com>2019-10-10 11:29:01 +0100
commita139420a3cfda6a4a4ee4750611b31dd71fc33f3 (patch)
tree9129aff6a5e73673054a1c9125fa977099a2b7db /synapse/config/registration.py
parentRewrite the user_filter migration again (#6184) (diff)
downloadsynapse-a139420a3cfda6a4a4ee4750611b31dd71fc33f3.tar.xz
Fix races in room stats (and other) updates. (#6187)
Hopefully this will fix the occasional failures we were seeing in the room directory.

The problem was that events are not necessarily persisted (and `current_state_delta_stream` updated) in the same order as their stream_id. So for instance current_state_delta 9 might be persisted *before* current_state_delta 8. Then, when the room stats saw stream_id 9, it assumed it had done everything up to 9, and never came back to do stream_id 8.

We can solve this easily by only processing up to the stream_id where we know all events have been persisted.
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