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| author | Eric Eastwood <erice@element.io> | 2021-10-14 18:53:45 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-10-14 18:53:45 -0500 |
| commit | daf498e099394e206709bbc7a330be4a989e31d5 (patch) | |
| tree | 4745df6d8fa6d78006d0db278576c41d8e42a2e8 /synapse/server.py | |
| parent | Ensure each charset is attempted only once during media preview. (#11089) (diff) | |
| download | synapse-daf498e099394e206709bbc7a330be4a989e31d5.tar.xz | |
Fix 500 error on `/messages` when we accumulate more than 5 backward extremities (#11027)
Found while working on the Gitter backfill script and noticed
it only happened after we sent 7 batches, https://gitlab.com/gitterHQ/webapp/-/merge_requests/2229#note_665906390
When there are more than 5 backward extremities for a given depth,
backfill will throw an error because we sliced the extremity list
to 5 but then try to iterate over the full list. This causes
us to look for state that we never fetched and we get a `KeyError`.
Before when calling `/messages` when there are more than 5 backward extremities:
```
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/synapse/http/server.py", line 258, in _async_render_wrapper
callback_return = await self._async_render(request)
File "/usr/local/lib/python3.8/site-packages/synapse/http/server.py", line 446, in _async_render
callback_return = await raw_callback_return
File "/usr/local/lib/python3.8/site-packages/synapse/rest/client/room.py", line 580, in on_GET
msgs = await self.pagination_handler.get_messages(
File "/usr/local/lib/python3.8/site-packages/synapse/handlers/pagination.py", line 396, in get_messages
await self.hs.get_federation_handler().maybe_backfill(
File "/usr/local/lib/python3.8/site-packages/synapse/handlers/federation.py", line 133, in maybe_backfill
return await self._maybe_backfill_inner(room_id, current_depth, limit)
File "/usr/local/lib/python3.8/site-packages/synapse/handlers/federation.py", line 386, in _maybe_backfill_inner
likely_extremeties_domains = get_domains_from_state(states[e_id])
KeyError: '$zpFflMEBtZdgcMQWTakaVItTLMjLFdKcRWUPHbbSZJl'
```Diffstat (limited to 'synapse/server.py')
0 files changed, 0 insertions, 0 deletions