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The Converge prog is now also responsible for matching the current Postgres version to the desired version. If there is a mismatch (current < desired), the Converge prog is launched. Roughly, the Converge prog does the following: 1. Provisions new servers. In case of upgrades, it only provisions upto one new standby if no existing standby is suitable for upgrades. 2. Wait for the required servers to be ready. 3. Wait for the maintenance window to start. 4. Fence the primary server, and launch pg_upgrade. 5. If the upgrade is successful, replace the current primary with the candidate standby. In case the upgrade fails, we delete the candidate standby and unfence the primary to bring the database back. During the Upgrade health checking is effectively disabled as the auto-recovery causes conflicts with the several restarts of various versions on the candidate. |
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