From c1b9922498dea4b2882d26a4eaef3e0a37e727fd Mon Sep 17 00:00:00 2001 From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> Date: Fri, 11 Jun 2021 14:45:53 +0100 Subject: Support for database schema version ranges (#9933) This is essentially an implementation of the proposal made at https://hackmd.io/@richvdh/BJYXQMQHO, though the details have ended up looking slightly different. --- synapse/storage/schema/__init__.py | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'synapse/storage/schema/__init__.py') diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py index f0d9f23167..d36ba1d773 100644 --- a/synapse/storage/schema/__init__.py +++ b/synapse/storage/schema/__init__.py @@ -12,6 +12,21 @@ # See the License for the specific language governing permissions and # limitations under the License. -# Remember to update this number every time a change is made to database -# schema files, so the users will be informed on server restarts. SCHEMA_VERSION = 59 +"""Represents the expectations made by the codebase about the database schema + +This should be incremented whenever the codebase changes its requirements on the +shape of the database schema (even if those requirements are backwards-compatible with +older versions of Synapse). + +See `README.md `_ for more information on how this +works. +""" + + +SCHEMA_COMPAT_VERSION = 59 +"""Limit on how far the synapse codebase can be rolled back without breaking db compat + +This value is stored in the database, and checked on startup. If the value in the +database is greater than SCHEMA_VERSION, then Synapse will refuse to start. +""" -- cgit 1.5.1