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coder/enterprise/coderd/prebuilds
Susana Ferreira ca94588bd5 fix: send prebuild job notification after job build db commit (#20693)
## Problem

Fix race condition in prebuilds reconciler. Previously, a job
notification event was sent to a Go channel before the provisioning
database transaction completed. The notification is consumed by a
separate goroutine that publishes to PostgreSQL's LISTEN/NOTIFY, using a
separate database connection. This creates a potential race: if a
provisioner daemon receives the notification and queries for the job
before the provisioning transaction commits, it won't find the job in
the database.

This manifested as a flaky test failure in `TestReinitializeAgent`,
where provisioners would occasionally miss newly created jobs. The test
uses a 25-second timeout context, while the acquirer's backup polling
mechanism checks for jobs every 30 seconds. This made the race condition
visible in tests, though in production the backup polling would
eventually pick up the job. The solution presented here guarantees that
a job notification is only sent after the provisioning database
transaction commits.

## Changes

* The `provision()` and `provisionDelete()` functions now return the
provisioner job instead of sending notifications internally.
* A new `publishProvisionerJob()` helper centralizes the notification
logic and is called after each transaction completes.

Closes: https://github.com/coder/internal/issues/963
2025-11-12 10:36:39 +00:00
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