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Fix schema delta for servers that have not backfilled (#8396)

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Fixes #8395.
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Erik Johnston 2020-09-25 09:58:32 +01:00 committed by GitHub
parent c77c4a2fcd
commit 3e87d79e1c
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3 changed files with 9 additions and 2 deletions
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1
changelog.d/8396.feature Normal file
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@ -0,0 +1 @@
Add experimental support for sharding event persister.

4
synapse/storage/databases/main/schema/delta/58/14events_instance_name.sql.postgres
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@ -21,6 +21,8 @@ SELECT setval('events_stream_seq', (
CREATE SEQUENCE IF NOT EXISTS events_backfill_stream_seq;
-- If the server has never backfilled a room then doing `-MIN(...)` will give
-- a negative result, hence why we do `GREATEST(...)`
SELECT setval('events_backfill_stream_seq', (
SELECT COALESCE(-MIN(stream_ordering), 1) FROM events
SELECT GREATEST(COALESCE(-MIN(stream_ordering), 1), 1) FROM events
));

6
synapse/storage/util/id_generators.py
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@ -287,8 +287,12 @@ class MultiWriterIdGenerator:
min_stream_id = min(self._current_positions.values(), default=None)
if min_stream_id is None:
# We add a GREATEST here to ensure that the result is always
# positive. (This can be a problem for e.g. backfill streams where
# the server has never backfilled).
sql = """
SELECT COALESCE(%(agg)s(%(id)s), 1) FROM %(table)s
SELECT GREATEST(COALESCE(%(agg)s(%(id)s), 1), 1)
FROM %(table)s
""" % {
"id": id_column,
"table": table,