Alexander Akhmetov
7c43c061a8
What is this feature? This PR further improves concurrent updates to the provenance table (a follow-up for #101688). The fix explicitly checks for a provenance record using SELECT ... FOR UPDATE for the databases that support it before performing either an update or upsert operation. This preemptive locking reduces the possibility of deadlocks in MySQL. This works only with the alertingProvenanceLockWrites feature flag enabled. Why do we need this feature? The current implementation (directly performing upserts without prior locking) may still encounter deadlocks because of the gap and insert-intention locks in some configurations, for example, with repeatable-read transaction isolation level in MySQL+InnoDB. --------- Co-authored-by: William Wernert <william.wernert@grafana.com>
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