From 28781b65e7cb8b0d1fc409d0d78253662b49fe06 Mon Sep 17 00:00:00 2001 From: Neil Johnson Date: Wed, 26 Sep 2018 16:16:41 +0100 Subject: [PATCH 1/2] fix #3854 --- synapse/storage/monthly_active_users.py | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/synapse/storage/monthly_active_users.py b/synapse/storage/monthly_active_users.py index 59580949f1..0fe8c8e24c 100644 --- a/synapse/storage/monthly_active_users.py +++ b/synapse/storage/monthly_active_users.py @@ -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,)) From d514608b5cc80cfe1f93a9953eb8264162c4a47b Mon Sep 17 00:00:00 2001 From: Neil Johnson Date: Wed, 26 Sep 2018 16:19:53 +0100 Subject: [PATCH 2/2] towncrier --- changelog.d/3961.bugfix | 1 + 1 file changed, 1 insertion(+) create mode 100644 changelog.d/3961.bugfix diff --git a/changelog.d/3961.bugfix b/changelog.d/3961.bugfix new file mode 100644 index 0000000000..e46b5834aa --- /dev/null +++ b/changelog.d/3961.bugfix @@ -0,0 +1 @@ +Fix errors due to concurrent monthly_active_user upserts