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Document that upgrading to Synapse v1.57 may be dangerous in some instances

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Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1766
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Slavi Pantaleev 2022-04-19 17:28:43 +03:00
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# 2022-04-19
## (Compatibility Break) Upgrading to Synapse v1.57 on setups using workers may require manual action
If you're running a worker setup for Synapse (`matrix_synapse_workers_enabled: true`), the [Synapse v1.57 upgrade notes](https://github.com/matrix-org/synapse/blob/v1.57.0rc1/docs/upgrade.md#changes-to-database-schema-for-application-services) say that you may need to take special care when upgrading:
> Synapse v1.57.0 includes a change to the way transaction IDs are managed for application services. If your deployment uses a dedicated worker for application service traffic, **it must be stopped** when the database is upgraded (which normally happens when the main process is upgraded), to ensure the change is made safely without any risk of reusing transaction IDs.
If you're not running an `appservice` worker (`matrix_synapse_workers_preset: little-federation-helper` or `matrix_synapse_workers_appservice_workers_count: 0`), you are probably safe to upgrade as per normal, without taking any special care.
If you are running a setup with an `appservice` worker, or otherwise want to be on the safe side, we recommend the following upgrade path:
0. Pull the latest playbook changes
1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
2. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all`)
3. Start Postgres (`systemctl start matrix-postgres` on the server)
4. Start the main Synapse process (`systemctl start matrix-synapse` on the server)
5. Wait a while so that Synapse can start and complete the database migrations. You can use `journalctl -fu matrix-synapse` on the server to get a clue. Waiting a few minutes should also be enough.
6. It should now be safe to start all other services. `ansible-playbook -i inventory/hosts setup.yml --tags=start` will do it for you
# 2022-04-14
## (Compatibility Break) Changes to `docker-src` permissions necessitating manual action