Merge tag 'v1.49.1'

Synapse 1.49.1 (2021-12-21)
===========================

This release fixes a regression introduced in Synapse 1.49.0 which could cause `/sync` requests to take significantly longer. This would particularly affect "initial" syncs for users participating in a large number of rooms, and in extreme cases, could make it impossible for such users to log in on a new client.

**Note:** in line with our [deprecation policy](https://matrix-org.github.io/synapse/latest/deprecation_policy.html) for platform dependencies, this will be the last release to support Python 3.6 and PostgreSQL 9.6, both of which have now reached upstream end-of-life. Synapse will require Python 3.7+ and PostgreSQL 10.

**Note:** We will also stop producing packages for Ubuntu 18.04 (Bionic Beaver) after this release, as it uses Python 3.6.

Bugfixes
--------

- Fix a performance regression in `/sync` handling, introduced in 1.49.0. ([\matrix-org#11583](matrix-org#11583))

Author: tulir

CHANGES.md

@@ -1,3 +1,18 @@
+Synapse 1.49.1 (2021-12-21)
+===========================
+
+This release fixes a regression introduced in Synapse 1.49.0 which could cause `/sync` requests to take significantly longer. This would particularly affect "initial" syncs for users participating in a large number of rooms, and in extreme cases, could make it impossible for such users to log in on a new client.
+
+**Note:** in line with our [deprecation policy](https://matrix-org.github.io/synapse/latest/deprecation_policy.html) for platform dependencies, this will be the last release to support Python 3.6 and PostgreSQL 9.6, both of which have now reached upstream end-of-life. Synapse will require Python 3.7+ and PostgreSQL 10.
+
+**Note:** We will also stop producing packages for Ubuntu 18.04 (Bionic Beaver) after this release, as it uses Python 3.6.
+
+Bugfixes
+--------
+
+- Fix a performance regression in `/sync` handling, introduced in 1.49.0. ([\#11583](https://github.com/matrix-org/synapse/issues/11583))
+
+
 Synapse 1.49.0 (2021-12-14)
 ===========================
 

debian/changelog

@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.49.1) stable; urgency=medium
+
+  * New synapse release 1.49.1.
+
+ -- Synapse Packaging team <[email protected]>  Tue, 21 Dec 2021 11:07:30 +0000
+
 matrix-synapse-py3 (1.49.0) stable; urgency=medium
 
   * New synapse release 1.49.0.

docs/deprecation_policy.md

@@ -14,8 +14,8 @@ i.e. when a version reaches End of Life Synapse will withdraw support for that
 version in future releases.
 
 Details on the upstream support life cycles for Python and PostgreSQL are
-documented at https://endoflife.date/python and
-https://endoflife.date/postgresql.
+documented at [https://endoflife.date/python](https://endoflife.date/python) and
+[https://endoflife.date/postgresql](https://endoflife.date/postgresql).
 
 
 Context

synapse/__init__.py

@@ -47,7 +47,7 @@
 except ImportError:
     pass
 
-__version__ = "1.49.0"
+__version__ = "1.49.1"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when

synapse/rest/client/sync.py

@@ -522,7 +522,15 @@ def serialize(events: Iterable[EventBase]) -> Awaitable[List[JsonDict]]:
                 time_now=time_now,
                 # Don't bother to bundle aggregations if the timeline is unlimited,
                 # as clients will have all the necessary information.
-                bundle_aggregations=room.timeline.limited,
+                # bundle_aggregations=room.timeline.limited,
+                #
+                # richvdh 2021-12-15: disable this temporarily as it has too high an
+                # overhead for initialsyncs. We need to figure out a way that the
+                # bundling can be done *before* the events are stored in the
+                # SyncResponseCache so that this part can be synchronous.
+                #
+                # Ensure to re-enable the test at tests/rest/client/test_relations.py::RelationsTestCase.test_bundled_aggregations.
+                bundle_aggregations=False,
                 token_id=token_id,
                 event_format=event_formatter,
                 only_event_fields=only_fields,

tests/rest/client/test_relations.py

@@ -574,11 +574,11 @@ def _find_and_assert_event(events):
         assert_bundle(channel.json_body["event"]["unsigned"].get("m.relations"))
 
         # Request sync.
-        channel = self.make_request("GET", "/sync", access_token=self.user_token)
-        self.assertEquals(200, channel.code, channel.json_body)
-        room_timeline = channel.json_body["rooms"]["join"][self.room]["timeline"]
-        self.assertTrue(room_timeline["limited"])
-        _find_and_assert_event(room_timeline["events"])
+        # channel = self.make_request("GET", "/sync", access_token=self.user_token)
+        # self.assertEquals(200, channel.code, channel.json_body)
+        # room_timeline = channel.json_body["rooms"]["join"][self.room]["timeline"]
+        # self.assertTrue(room_timeline["limited"])
+        # _find_and_assert_event(room_timeline["events"])
 
         # Note that /relations is tested separately in test_aggregation_get_event_for_thread
         # since it needs different data configured.