Merge tag 'v1.34.0' into babolivier/dinsic_1.41.0

Synapse 1.34.0 (2021-05-17)
===========================

This release deprecates the `room_invite_state_types` configuration setting. See the [upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.34.0/UPGRADE.rst#upgrading-to-v1340) for instructions on updating your configuration file to use the new `room_prejoin_state` setting.

This release also deprecates the `POST /_synapse/admin/v1/rooms/<room_id>/delete` admin API route. Server administrators are encouraged to update their scripts to use the new `DELETE /_synapse/admin/v1/rooms/<room_id>` route instead.

No significant changes since v1.34.0rc1.

Synapse 1.34.0rc1 (2021-05-12)
==============================

Features
--------

- Add experimental option to track memory usage of the caches. ([\#9881](https://github.com/matrix-org/synapse/issues/9881))
- Add support for `DELETE /_synapse/admin/v1/rooms/<room_id>`. ([\#9889](https://github.com/matrix-org/synapse/issues/9889))
- Add limits to how often Synapse will GC, ensuring that large servers do not end up GC thrashing if `gc_thresholds` has not been correctly set. ([\#9902](https://github.com/matrix-org/synapse/issues/9902))
- Improve performance of sending events for worker-based deployments using Redis. ([\#9905](https://github.com/matrix-org/synapse/issues/9905), [\#9950](https://github.com/matrix-org/synapse/issues/9950), [\#9951](https://github.com/matrix-org/synapse/issues/9951))
- Improve performance after joining a large room when presence is enabled. ([\#9910](https://github.com/matrix-org/synapse/issues/9910), [\#9916](https://github.com/matrix-org/synapse/issues/9916))
- Support stable identifiers for [MSC1772](https://github.com/matrix-org/matrix-doc/pull/1772) Spaces. `m.space.child` events will now be taken into account when populating the experimental spaces summary response. Please see [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.34.0/UPGRADE.rst#upgrading-to-v1340) if you have customised `room_invite_state_types` in your configuration. ([\#9915](https://github.com/matrix-org/synapse/issues/9915), [\#9966](https://github.com/matrix-org/synapse/issues/9966))
- Improve performance of backfilling in large rooms. ([\#9935](https://github.com/matrix-org/synapse/issues/9935))
- Add a config option to allow you to prevent device display names from being shared over federation. Contributed by @aaronraimist. ([\#9945](https://github.com/matrix-org/synapse/issues/9945))
- Update support for [MSC2946](https://github.com/matrix-org/matrix-doc/pull/2946): Spaces Summary. ([\#9947](https://github.com/matrix-org/synapse/issues/9947), [\#9954](https://github.com/matrix-org/synapse/issues/9954))

Bugfixes
--------

- Fix a bug introduced in v1.32.0 where the associated connection was improperly logged for SQL logging statements. ([\#9895](https://github.com/matrix-org/synapse/issues/9895))
- Correct the type hint for the `user_may_create_room_alias` method of spam checkers. It is provided a `RoomAlias`, not a `str`. ([\#9896](https://github.com/matrix-org/synapse/issues/9896))
- Fix bug where user directory could get out of sync if room visibility and membership changed in quick succession. ([\#9910](https://github.com/matrix-org/synapse/issues/9910))
- Include the `origin_server_ts` property in the experimental [MSC2946](https://github.com/matrix-org/matrix-doc/pull/2946) support to allow clients to properly sort rooms. ([\#9928](https://github.com/matrix-org/synapse/issues/9928))
- Fix bugs introduced in v1.23.0 which made the PostgreSQL port script fail when run with a newly-created SQLite database. ([\#9930](https://github.com/matrix-org/synapse/issues/9930))
- Fix a bug introduced in Synapse 1.29.0 which caused `m.room_key_request` to-device messages sent from one user to another to be dropped. ([\#9961](https://github.com/matrix-org/synapse/issues/9961), [\#9965](https://github.com/matrix-org/synapse/issues/9965))
- Fix a bug introduced in v1.27.0 preventing users and appservices exempt from ratelimiting from creating rooms with many invitees. ([\#9968](https://github.com/matrix-org/synapse/issues/9968))

Updates to the Docker image
---------------------------

- Add `startup_delay` to docker healthcheck to reduce waiting time for coming online and update the documentation with extra options. Contributed by @Maquis196. ([\#9913](https://github.com/matrix-org/synapse/issues/9913))

Improved Documentation
----------------------

- Add `port` argument to the Postgres database sample config section. ([\#9911](https://github.com/matrix-org/synapse/issues/9911))

Deprecations and Removals
-------------------------

- Mark as deprecated `POST /_synapse/admin/v1/rooms/<room_id>/delete`. ([\#9889](https://github.com/matrix-org/synapse/issues/9889))

Internal Changes
----------------

- Reduce the length of Synapse's access tokens. ([\#5588](https://github.com/matrix-org/synapse/issues/5588))
- Export jemalloc stats to Prometheus if it is being used. ([\#9882](https://github.com/matrix-org/synapse/issues/9882))
- Add type hints to presence handler. ([\#9885](https://github.com/matrix-org/synapse/issues/9885))
- Reduce memory usage of the LRU caches. ([\#9886](https://github.com/matrix-org/synapse/issues/9886))
- Add type hints to the `synapse.handlers` module. ([\#9896](https://github.com/matrix-org/synapse/issues/9896))
- Time response time for external cache requests. ([\#9904](https://github.com/matrix-org/synapse/issues/9904))
- Minor fixes to the `make_full_schema.sh` script. ([\#9931](https://github.com/matrix-org/synapse/issues/9931))
- Move database schema files into a common directory. ([\#9932](https://github.com/matrix-org/synapse/issues/9932))
- Add debug logging for lost/delayed to-device messages. ([\#9959](https://github.com/matrix-org/synapse/issues/9959))

1 files changed, 17 insertions, 2 deletions

diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py

index 31b7b3c256..fef2846669 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -535,6 +535,13 @@ class ReactorLastSeenMetric:
 
 REGISTRY.register(ReactorLastSeenMetric())
 
+# The minimum time in seconds between GCs for each generation, regardless of the current GC
+# thresholds and counts.
+MIN_TIME_BETWEEN_GCS = (1.0, 10.0, 30.0)
+
+# The time (in seconds since the epoch) of the last time we did a GC for each generation.
+_last_gc = [0.0, 0.0, 0.0]
+
 
 def runUntilCurrentTimer(reactor, func):
     @functools.wraps(func)
@@ -575,11 +582,16 @@ def runUntilCurrentTimer(reactor, func):
             return ret
 
         # Check if we need to do a manual GC (since its been disabled), and do
-        # one if necessary.
+        # one if necessary. Note we go in reverse order as e.g. a gen 1 GC may
+        # promote an object into gen 2, and we don't want to handle the same
+        # object multiple times.
         threshold = gc.get_threshold()
         counts = gc.get_count()
         for i in (2, 1, 0):
-            if threshold[i] < counts[i]:
+            # We check if we need to do one based on a straightforward
+            # comparison between the threshold and count. We also do an extra
+            # check to make sure that we don't a GC too often.
+            if threshold[i] < counts[i] and MIN_TIME_BETWEEN_GCS[i] < end - _last_gc[i]:
                 if i == 0:
                     logger.debug("Collecting gc %d", i)
                 else:
@@ -589,6 +601,8 @@ def runUntilCurrentTimer(reactor, func):
                 unreachable = gc.collect(i)
                 end = time.time()
 
+                _last_gc[i] = end
+
                 gc_time.labels(i).observe(end - start)
                 gc_unreachable.labels(i).set(unreachable)
 
@@ -615,6 +629,7 @@ try:
 except AttributeError:
     pass
 
+
 __all__ = [
     "MetricsResource",
     "generate_latest",