Use PostgreSQL advisory locks to enforce only one subscription instance #98
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PostgreSQL's `pg_try_advisory_lock` function is used to acquire a session lock on the subscription id to guarantee that only once instance can run. Each subscription now has its own connection. When the subscription process goes down, the connection will terminate and its lock will be released.
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PostgreSQL's
pg_try_advisory_lockfunction is used to acquire a session lock on the subscription id to guarantee that only once uniquely named subscription instance can run.Each subscription now has its own connection. When the subscription process goes down, the connection will terminate and its lock will be released.
This supports running EventStore on multiple independent nodes without requiring them to form a cluster, but still guarantees subscriptions run once.