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Merge pull request #3961 from matrix-org/neilj/lock_mau_upserts

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fix #3854 MAU transaction errors
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Richard van der Hoff 2018-09-27 12:31:37 +01:00 committed by GitHub
commit 51d33d5178
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2 changed files with 5 additions and 1 deletions
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changelog.d/3961.bugfix Normal file
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@ -0,0 +1 @@
Fix errors due to concurrent monthly_active_user upserts

5
synapse/storage/monthly_active_users.py
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@ -172,6 +172,10 @@ class MonthlyActiveUsersStore(SQLBaseStore):
Deferred[bool]: True if a new entry was created, False if an
existing one was updated.
"""
# Am consciously deciding to lock the table on the basis that is ought
# never be a big table and alternative approaches (batching multiple
# upserts into a single txn) introduced a lot of extra complexity.
# See https://github.com/matrix-org/synapse/issues/3854 for more
is_insert = yield self._simple_upsert(
desc="upsert_monthly_active_user",
table="monthly_active_users",
@ -181,7 +185,6 @@ class MonthlyActiveUsersStore(SQLBaseStore):
values={
"timestamp": int(self._clock.time_msec()),
},
lock=False,
)
if is_insert:
self.user_last_seen_monthly_active.invalidate((user_id,))