PostgreSQL Advisory Locks Offer a Built-In Fix for Distributed Race Conditions

Race conditions in clustered applications occur when multiple pods process the same request simultaneously, leading to errors like duplicate payouts or double-credited rewards. Common fixes such as Java's synchronized keyword fail in multi-pod deployments, while row-level database locks require a pre-existing row and can cause storage overhead. Introducing a separate Redis cluster adds operational complexity and potential split-brain failure risks. PostgreSQL Advisory Locks provide an alternative by letting applications define integer-keyed locks held directly in the database server's memory, with no row or table attachment. Since most teams already rely on PostgreSQL as their primary datastore, this approach eliminates the need for additional infrastructure while effectively serializing critical operations across pods.