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Use a sequence to generate AS transaction IDs, drop last_txn AS state (#12209)

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Switching to a sequence means there's no need to track `last_txn` on the
AS state table to generate new TXN IDs. This also means that there is
no longer contention between the AS scheduler and AS handler on updates
to the `application_services_state` table, which will prevent serialization
errors during the complete AS txn transaction.
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Nick Mills-Barrett 2022-04-01 14:33:25 +01:00 • committed by GitHub
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docs/upgrade.md
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@ -85,6 +85,19 @@ process, for example:
dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
```
# Upgrading to v1.57.0
## Changes to database schema for application services
Synapse v1.57.0 includes a [change](https://github.com/matrix-org/synapse/pull/12209) 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.
Deployments which do not use separate worker processes can be upgraded as normal. Similarly,
deployments where no applciation services are in use can be upgraded as normal.
# Upgrading to v1.56.0
## Groups/communities feature has been deprecated