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-rw-r--r--CHANGES.md79
-rw-r--r--changelog.d/10013.misc1
-rw-r--r--changelog.d/10035.feature1
-rw-r--r--changelog.d/10040.feature1
-rw-r--r--changelog.d/10044.feature1
-rw-r--r--changelog.d/10046.doc1
-rw-r--r--changelog.d/10048.misc1
-rw-r--r--changelog.d/10054.misc1
-rw-r--r--changelog.d/10055.misc1
-rw-r--r--changelog.d/10057.doc1
-rw-r--r--changelog.d/10059.misc1
-rw-r--r--changelog.d/10063.removal1
-rw-r--r--changelog.d/10069.misc1
-rw-r--r--changelog.d/10074.misc1
-rw-r--r--changelog.d/10077.feature1
-rw-r--r--changelog.d/10078.misc1
-rw-r--r--changelog.d/10082.bugfix1
-rw-r--r--changelog.d/10084.feature1
-rw-r--r--changelog.d/10086.doc1
-rw-r--r--changelog.d/10089.doc1
-rw-r--r--changelog.d/10091.misc1
-rw-r--r--changelog.d/10092.bugfix1
-rw-r--r--changelog.d/10094.misc1
-rw-r--r--changelog.d/10102.misc1
-rw-r--r--changelog.d/10105.misc1
-rw-r--r--changelog.d/10107.bugfix1
-rw-r--r--changelog.d/10111.misc1
-rw-r--r--changelog.d/10112.misc1
-rw-r--r--changelog.d/10113.feature1
-rw-r--r--changelog.d/10116.bugfix1
-rw-r--r--changelog.d/10117.feature1
-rw-r--r--changelog.d/10118.bugfix1
-rw-r--r--changelog.d/10124.misc1
-rw-r--r--changelog.d/10130.doc1
-rw-r--r--changelog.d/10132.doc1
-rw-r--r--changelog.d/10133.bugfix1
-rw-r--r--changelog.d/10135.misc1
-rw-r--r--changelog.d/10136.feature1
-rw-r--r--changelog.d/10137.misc1
-rw-r--r--changelog.d/10141.feature1
-rw-r--r--changelog.d/9221.doc1
-rw-r--r--changelog.d/9224.feature1
-rw-r--r--changelog.d/9906.misc1
-rw-r--r--changelog.d/9953.feature1
-rw-r--r--changelog.d/9973.feature1
-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/handlers/presence.py50
-rw-r--r--synapse/storage/databases/main/presence.py2
-rw-r--r--synapse/storage/util/id_generators.py15
49 files changed, 127 insertions, 65 deletions
diff --git a/CHANGES.md b/CHANGES.md
index 04d260f8e5..aeec4fa5fa 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,82 @@
+Synapse 1.36.0rc2 (2021-06-11)
+==============================
+
+Bugfixes
+--------
+
+- Fix a bug which caused  presence updates to stop working some time after a restart, when using a presence writer worker. Broke in v1.33.0. ([\#10149](https://github.com/matrix-org/synapse/issues/10149))
+- Fix a bug when using federation sender worker where it would send out more presence updates than necessary, leading to high resource usage. Broke in v1.33.0. ([\#10163](https://github.com/matrix-org/synapse/issues/10163))
+- Fix a bug where Synapse could send the same presence update to a remote twice. ([\#10165](https://github.com/matrix-org/synapse/issues/10165))
+
+
+Synapse 1.36.0rc1 (2021-06-08)
+==============================
+
+Features
+--------
+
+- Add new endpoint `/_matrix/client/r0/rooms/{roomId}/aliases` from Client-Server API r0.6.1 (previously [MSC2432](https://github.com/matrix-org/matrix-doc/pull/2432)). ([\#9224](https://github.com/matrix-org/synapse/issues/9224))
+- Improve performance of incoming federation transactions in large rooms. ([\#9953](https://github.com/matrix-org/synapse/issues/9953), [\#9973](https://github.com/matrix-org/synapse/issues/9973))
+- Rewrite logic around verifying JSON object and fetching server keys to be more performant and use less memory. ([\#10035](https://github.com/matrix-org/synapse/issues/10035))
+- Add new admin APIs for unprotecting local media from quarantine. Contributed by @dklimpel. ([\#10040](https://github.com/matrix-org/synapse/issues/10040))
+- Add new admin APIs to remove media by media ID from quarantine. Contributed by @dklimpel. ([\#10044](https://github.com/matrix-org/synapse/issues/10044))
+- Make reason and score parameters optional for reporting content. Implements [MSC2414](https://github.com/matrix-org/matrix-doc/pull/2414). Contributed by Callum Brown. ([\#10077](https://github.com/matrix-org/synapse/issues/10077))
+- Add support for routing more requests to workers. ([\#10084](https://github.com/matrix-org/synapse/issues/10084))
+- Report OpenTracing spans for database activity. ([\#10113](https://github.com/matrix-org/synapse/issues/10113), [\#10136](https://github.com/matrix-org/synapse/issues/10136), [\#10141](https://github.com/matrix-org/synapse/issues/10141))
+- Significantly reduce memory usage of joining large remote rooms. ([\#10117](https://github.com/matrix-org/synapse/issues/10117))
+
+
+Bugfixes
+--------
+
+- Fixed a bug causing replication requests to fail when receiving a lot of events via federation. ([\#10082](https://github.com/matrix-org/synapse/issues/10082))
+- Fix a bug in the `force_tracing_for_users` option introduced in Synapse v1.35 which meant that the OpenTracing spans produced were missing most tags. ([\#10092](https://github.com/matrix-org/synapse/issues/10092))
+- Fixed a bug that could cause Synapse to stop notifying application services. Contributed by Willem Mulder. ([\#10107](https://github.com/matrix-org/synapse/issues/10107))
+- Fix bug where the server would attempt to fetch the same history in the room from a remote server multiple times in parallel. ([\#10116](https://github.com/matrix-org/synapse/issues/10116))
+- Fix a bug introduced in Synapse 1.33.0 which caused replication requests to fail when receiving a lot of very large events via federation. ([\#10118](https://github.com/matrix-org/synapse/issues/10118))
+- Fix bug when using workers where pagination requests failed if a remote server returned zero events from `/backfill`. Introduced in 1.35.0. ([\#10133](https://github.com/matrix-org/synapse/issues/10133))
+
+
+Improved Documentation
+----------------------
+
+- Clarify security note regarding hosting Synapse on the same domain as other web applications. ([\#9221](https://github.com/matrix-org/synapse/issues/9221))
+- Update CAPTCHA documentation to mention turning off the verify origin feature. Contributed by @aaronraimist. ([\#10046](https://github.com/matrix-org/synapse/issues/10046))
+- Tweak wording of database recommendation in `INSTALL.md`. Contributed by @aaronraimist. ([\#10057](https://github.com/matrix-org/synapse/issues/10057))
+- Add initial infrastructure for rendering Synapse documentation with mdbook. ([\#10086](https://github.com/matrix-org/synapse/issues/10086))
+- Convert the remaining Admin API documentation files to markdown. ([\#10089](https://github.com/matrix-org/synapse/issues/10089))
+- Make a link in docs use HTTPS. Contributed by @RhnSharma. ([\#10130](https://github.com/matrix-org/synapse/issues/10130))
+- Fix broken link in Docker docs. ([\#10132](https://github.com/matrix-org/synapse/issues/10132))
+
+
+Deprecations and Removals
+-------------------------
+
+- Remove the experimental `spaces_enabled` flag. The spaces features are always available now. ([\#10063](https://github.com/matrix-org/synapse/issues/10063))
+
+
+Internal Changes
+----------------
+
+- Tell CircleCI to build Docker images from `main` branch. ([\#9906](https://github.com/matrix-org/synapse/issues/9906))
+- Simplify naming convention for release branches to only include the major and minor version numbers. ([\#10013](https://github.com/matrix-org/synapse/issues/10013))
+- Add `parse_strings_from_args` for parsing an array from query parameters. ([\#10048](https://github.com/matrix-org/synapse/issues/10048), [\#10137](https://github.com/matrix-org/synapse/issues/10137))
+- Remove some dead code regarding TLS certificate handling. ([\#10054](https://github.com/matrix-org/synapse/issues/10054))
+- Remove redundant, unmaintained `convert_server_keys` script. ([\#10055](https://github.com/matrix-org/synapse/issues/10055))
+- Improve the error message printed by synctl when synapse fails to start. ([\#10059](https://github.com/matrix-org/synapse/issues/10059))
+- Fix GitHub Actions lint for newsfragments. ([\#10069](https://github.com/matrix-org/synapse/issues/10069))
+- Update opentracing to inject the right context into the carrier. ([\#10074](https://github.com/matrix-org/synapse/issues/10074))
+- Fix up `BatchingQueue` implementation. ([\#10078](https://github.com/matrix-org/synapse/issues/10078))
+- Log method and path when dropping request due to size limit. ([\#10091](https://github.com/matrix-org/synapse/issues/10091))
+- In Github Actions workflows, summarize the Sytest results in an easy-to-read format. ([\#10094](https://github.com/matrix-org/synapse/issues/10094))
+- Make `/sync` do fewer state resolutions. ([\#10102](https://github.com/matrix-org/synapse/issues/10102))
+- Add missing type hints to the admin API servlets. ([\#10105](https://github.com/matrix-org/synapse/issues/10105))
+- Improve opentracing annotations for `Notifier`. ([\#10111](https://github.com/matrix-org/synapse/issues/10111))
+- Enable Prometheus metrics for the jaeger client library. ([\#10112](https://github.com/matrix-org/synapse/issues/10112))
+- Work to improve the responsiveness of `/sync` requests. ([\#10124](https://github.com/matrix-org/synapse/issues/10124))
+- OpenTracing: use a consistent name for background processes. ([\#10135](https://github.com/matrix-org/synapse/issues/10135))
+
+
 Synapse 1.35.1 (2021-06-03)
 ===========================
 
diff --git a/changelog.d/10013.misc b/changelog.d/10013.misc
deleted file mode 100644
index 9d164d9ce2..0000000000
--- a/changelog.d/10013.misc
+++ /dev/null
@@ -1 +0,0 @@
-Simplify naming convention for release branches to only include the major and minor version numbers.
diff --git a/changelog.d/10035.feature b/changelog.d/10035.feature
deleted file mode 100644
index 68052b5a7e..0000000000
--- a/changelog.d/10035.feature
+++ /dev/null
@@ -1 +0,0 @@
-Rewrite logic around verifying JSON object and fetching server keys to be more performant and use less memory.
diff --git a/changelog.d/10040.feature b/changelog.d/10040.feature
deleted file mode 100644
index ec78a30f00..0000000000
--- a/changelog.d/10040.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add an admin API for unprotecting local media from quarantine. Contributed by @dklimpel.
diff --git a/changelog.d/10044.feature b/changelog.d/10044.feature
deleted file mode 100644
index 70c0a3851e..0000000000
--- a/changelog.d/10044.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add new admin APIs to remove media by media ID from quarantine. Contributed by @dkimpel.
diff --git a/changelog.d/10046.doc b/changelog.d/10046.doc
deleted file mode 100644
index 995960163b..0000000000
--- a/changelog.d/10046.doc
+++ /dev/null
@@ -1 +0,0 @@
-Update CAPTCHA documentation to mention turning off the verify origin feature. Contributed by @aaronraimist.
diff --git a/changelog.d/10048.misc b/changelog.d/10048.misc
deleted file mode 100644
index a901f8431e..0000000000
--- a/changelog.d/10048.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add `parse_strings_from_args` for parsing an array from query parameters.
diff --git a/changelog.d/10054.misc b/changelog.d/10054.misc
deleted file mode 100644
index cebe39ce54..0000000000
--- a/changelog.d/10054.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove some dead code regarding TLS certificate handling.
diff --git a/changelog.d/10055.misc b/changelog.d/10055.misc
deleted file mode 100644
index da84a2dde8..0000000000
--- a/changelog.d/10055.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove redundant, unmaintained `convert_server_keys` script.
diff --git a/changelog.d/10057.doc b/changelog.d/10057.doc
deleted file mode 100644
index 35437cb017..0000000000
--- a/changelog.d/10057.doc
+++ /dev/null
@@ -1 +0,0 @@
-Tweak wording of database recommendation in `INSTALL.md`. Contributed by @aaronraimist.
\ No newline at end of file
diff --git a/changelog.d/10059.misc b/changelog.d/10059.misc
deleted file mode 100644
index ca6e0e8a5a..0000000000
--- a/changelog.d/10059.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve the error message printed by synctl when synapse fails to start.
diff --git a/changelog.d/10063.removal b/changelog.d/10063.removal
deleted file mode 100644
index 0f8889b6b4..0000000000
--- a/changelog.d/10063.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove the experimental `spaces_enabled` flag. The spaces features are always available now.
diff --git a/changelog.d/10069.misc b/changelog.d/10069.misc
deleted file mode 100644
index a8d2629e9b..0000000000
--- a/changelog.d/10069.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix GitHub Actions lint for newsfragments.
diff --git a/changelog.d/10074.misc b/changelog.d/10074.misc
deleted file mode 100644
index 8dbe2cd2bc..0000000000
--- a/changelog.d/10074.misc
+++ /dev/null
@@ -1 +0,0 @@
-Update opentracing to inject the right context into the carrier.
diff --git a/changelog.d/10077.feature b/changelog.d/10077.feature
deleted file mode 100644
index 808feb2215..0000000000
--- a/changelog.d/10077.feature
+++ /dev/null
@@ -1 +0,0 @@
-Make reason and score parameters optional for reporting content. Implements [MSC2414](https://github.com/matrix-org/matrix-doc/pull/2414). Contributed by Callum Brown.
diff --git a/changelog.d/10078.misc b/changelog.d/10078.misc
deleted file mode 100644
index a4b089d0fd..0000000000
--- a/changelog.d/10078.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix up `BatchingQueue` implementation.
diff --git a/changelog.d/10082.bugfix b/changelog.d/10082.bugfix
deleted file mode 100644
index b4f8bcc4fa..0000000000
--- a/changelog.d/10082.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fixed a bug causing replication requests to fail when receiving a lot of events via federation.
diff --git a/changelog.d/10084.feature b/changelog.d/10084.feature
deleted file mode 100644
index 602cb6ff51..0000000000
--- a/changelog.d/10084.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add support for routing more requests to workers.
diff --git a/changelog.d/10086.doc b/changelog.d/10086.doc
deleted file mode 100644
index 2200579012..0000000000
--- a/changelog.d/10086.doc
+++ /dev/null
@@ -1 +0,0 @@
-Add initial infrastructure for rendering Synapse documentation with mdbook.
diff --git a/changelog.d/10089.doc b/changelog.d/10089.doc
deleted file mode 100644
index d9e93773ab..0000000000
--- a/changelog.d/10089.doc
+++ /dev/null
@@ -1 +0,0 @@
-Convert the remaining Admin API documentation files to markdown.
diff --git a/changelog.d/10091.misc b/changelog.d/10091.misc
deleted file mode 100644
index dbe310fd17..0000000000
--- a/changelog.d/10091.misc
+++ /dev/null
@@ -1 +0,0 @@
-Log method and path when dropping request due to size limit.
diff --git a/changelog.d/10092.bugfix b/changelog.d/10092.bugfix
deleted file mode 100644
index 09b2aba7ff..0000000000
--- a/changelog.d/10092.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug in the `force_tracing_for_users` option introduced in Synapse v1.35 which meant that the OpenTracing spans produced were missing most tags.
diff --git a/changelog.d/10094.misc b/changelog.d/10094.misc
deleted file mode 100644
index 01efe14f74..0000000000
--- a/changelog.d/10094.misc
+++ /dev/null
@@ -1 +0,0 @@
-In Github Actions workflows, summarize the Sytest results in an easy-to-read format.
diff --git a/changelog.d/10102.misc b/changelog.d/10102.misc
deleted file mode 100644
index 87672ee295..0000000000
--- a/changelog.d/10102.misc
+++ /dev/null
@@ -1 +0,0 @@
-Make `/sync` do fewer state resolutions.
diff --git a/changelog.d/10105.misc b/changelog.d/10105.misc
deleted file mode 100644
index 244a893d3e..0000000000
--- a/changelog.d/10105.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add missing type hints to the admin API servlets.
\ No newline at end of file
diff --git a/changelog.d/10107.bugfix b/changelog.d/10107.bugfix
deleted file mode 100644
index 80030efab2..0000000000
--- a/changelog.d/10107.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fixed a bug that could cause Synapse to stop notifying application services. Contributed by Willem Mulder.
diff --git a/changelog.d/10111.misc b/changelog.d/10111.misc
deleted file mode 100644
index 42e42b69ab..0000000000
--- a/changelog.d/10111.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve opentracing annotations for `Notifier`.
diff --git a/changelog.d/10112.misc b/changelog.d/10112.misc
deleted file mode 100644
index 40af09760c..0000000000
--- a/changelog.d/10112.misc
+++ /dev/null
@@ -1 +0,0 @@
-Enable Prometheus metrics for the jaeger client library.
diff --git a/changelog.d/10113.feature b/changelog.d/10113.feature
deleted file mode 100644
index 2658ab8918..0000000000
--- a/changelog.d/10113.feature
+++ /dev/null
@@ -1 +0,0 @@
-Report OpenTracing spans for database activity.
diff --git a/changelog.d/10116.bugfix b/changelog.d/10116.bugfix
deleted file mode 100644
index 90ef707559..0000000000
--- a/changelog.d/10116.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug where the server would attempt to fetch the same history in the room from a remote server multiple times in parallel.
diff --git a/changelog.d/10117.feature b/changelog.d/10117.feature
deleted file mode 100644
index e137e142c6..0000000000
--- a/changelog.d/10117.feature
+++ /dev/null
@@ -1 +0,0 @@
-Significantly reduce memory usage of joining large remote rooms.
diff --git a/changelog.d/10118.bugfix b/changelog.d/10118.bugfix
deleted file mode 100644
index db62b50e0b..0000000000
--- a/changelog.d/10118.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in Synapse 1.33.0 which caused replication requests to fail when receiving a lot of very large events via federation.
diff --git a/changelog.d/10124.misc b/changelog.d/10124.misc
deleted file mode 100644
index c06593238d..0000000000
--- a/changelog.d/10124.misc
+++ /dev/null
@@ -1 +0,0 @@
-Work to improve the responsiveness of `/sync` requests.
diff --git a/changelog.d/10130.doc b/changelog.d/10130.doc
deleted file mode 100644
index 42ed1f3eac..0000000000
--- a/changelog.d/10130.doc
+++ /dev/null
@@ -1 +0,0 @@
-Make a link in docs use HTTPS. Contributed by @RhnSharma.
diff --git a/changelog.d/10132.doc b/changelog.d/10132.doc
deleted file mode 100644
index 70f538f077..0000000000
--- a/changelog.d/10132.doc
+++ /dev/null
@@ -1 +0,0 @@
-Fix broken link in Docker docs.
diff --git a/changelog.d/10133.bugfix b/changelog.d/10133.bugfix
deleted file mode 100644
index a62c15b260..0000000000
--- a/changelog.d/10133.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug when using workers where pagination requests failed if a remote server returned zero events from `/backfill`. Introduced in 1.35.0.
diff --git a/changelog.d/10135.misc b/changelog.d/10135.misc
deleted file mode 100644
index 17819cbbcc..0000000000
--- a/changelog.d/10135.misc
+++ /dev/null
@@ -1 +0,0 @@
-OpenTracing: use a consistent name for background processes.
diff --git a/changelog.d/10136.feature b/changelog.d/10136.feature
deleted file mode 100644
index 2658ab8918..0000000000
--- a/changelog.d/10136.feature
+++ /dev/null
@@ -1 +0,0 @@
-Report OpenTracing spans for database activity.
diff --git a/changelog.d/10137.misc b/changelog.d/10137.misc
deleted file mode 100644
index a901f8431e..0000000000
--- a/changelog.d/10137.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add `parse_strings_from_args` for parsing an array from query parameters.
diff --git a/changelog.d/10141.feature b/changelog.d/10141.feature
deleted file mode 100644
index 2658ab8918..0000000000
--- a/changelog.d/10141.feature
+++ /dev/null
@@ -1 +0,0 @@
-Report OpenTracing spans for database activity.
diff --git a/changelog.d/9221.doc b/changelog.d/9221.doc
deleted file mode 100644
index 9b3476064b..0000000000
--- a/changelog.d/9221.doc
+++ /dev/null
@@ -1 +0,0 @@
-Clarify security note regarding hosting Synapse on the same domain as other web applications.
diff --git a/changelog.d/9224.feature b/changelog.d/9224.feature
deleted file mode 100644
index 76519c23e2..0000000000
--- a/changelog.d/9224.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add new endpoint `/_matrix/client/r0/rooms/{roomId}/aliases` from Client-Server API r0.6.1 (previously [MSC2432](https://github.com/matrix-org/matrix-doc/pull/2432)).
diff --git a/changelog.d/9906.misc b/changelog.d/9906.misc
deleted file mode 100644
index 667d51a4c0..0000000000
--- a/changelog.d/9906.misc
+++ /dev/null
@@ -1 +0,0 @@
-Tell CircleCI to build Docker images from `main` branch.
diff --git a/changelog.d/9953.feature b/changelog.d/9953.feature
deleted file mode 100644
index 6b3d1adc70..0000000000
--- a/changelog.d/9953.feature
+++ /dev/null
@@ -1 +0,0 @@
-Improve performance of incoming federation transactions in large rooms.
diff --git a/changelog.d/9973.feature b/changelog.d/9973.feature
deleted file mode 100644
index 6b3d1adc70..0000000000
--- a/changelog.d/9973.feature
+++ /dev/null
@@ -1 +0,0 @@
-Improve performance of incoming federation transactions in large rooms.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 445e8a5cad..407ba14a76 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -47,7 +47,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.35.1"
+__version__ = "1.36.0rc2"
 
 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
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index f5a049d754..44ed7a0712 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -299,14 +299,14 @@ class BasePresenceHandler(abc.ABC):
         if not states:
             return
 
-        hosts_and_states = await get_interested_remotes(
+        hosts_to_states = await get_interested_remotes(
             self.store,
             self.presence_router,
             states,
         )
 
-        for destinations, states in hosts_and_states:
-            self._federation.send_presence_to_destinations(states, destinations)
+        for destination, host_states in hosts_to_states.items():
+            self._federation.send_presence_to_destinations(host_states, [destination])
 
     async def send_full_presence_to_users(self, user_ids: Collection[str]):
         """
@@ -495,9 +495,6 @@ class WorkerPresenceHandler(BasePresenceHandler):
             users=users_to_states.keys(),
         )
 
-        # If this is a federation sender, notify about presence updates.
-        await self.maybe_send_presence_to_interested_destinations(states)
-
     async def process_replication_rows(
         self, stream_name: str, instance_name: str, token: int, rows: list
     ):
@@ -519,11 +516,27 @@ class WorkerPresenceHandler(BasePresenceHandler):
             for row in rows
         ]
 
-        for state in states:
-            self.user_to_current_state[state.user_id] = state
+        # The list of states to notify sync streams and remote servers about.
+        # This is calculated by comparing the old and new states for each user
+        # using `should_notify(..)`.
+        #
+        # Note that this is necessary as the presence writer will periodically
+        # flush presence state changes that should not be notified about to the
+        # DB, and so will be sent over the replication stream.
+        state_to_notify = []
+
+        for new_state in states:
+            old_state = self.user_to_current_state.get(new_state.user_id)
+            self.user_to_current_state[new_state.user_id] = new_state
+
+            if not old_state or should_notify(old_state, new_state):
+                state_to_notify.append(new_state)
 
         stream_id = token
-        await self.notify_from_replication(states, stream_id)
+        await self.notify_from_replication(state_to_notify, stream_id)
+
+        # If this is a federation sender, notify about presence updates.
+        await self.maybe_send_presence_to_interested_destinations(state_to_notify)
 
     def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
         return [
@@ -829,15 +842,15 @@ class PresenceHandler(BasePresenceHandler):
             if to_federation_ping:
                 federation_presence_out_counter.inc(len(to_federation_ping))
 
-                hosts_and_states = await get_interested_remotes(
+                hosts_to_states = await get_interested_remotes(
                     self.store,
                     self.presence_router,
                     list(to_federation_ping.values()),
                 )
 
-                for destinations, states in hosts_and_states:
+                for destination, states in hosts_to_states.items():
                     self._federation_queue.send_presence_to_destinations(
-                        states, destinations
+                        states, [destination]
                     )
 
     async def _handle_timeouts(self) -> None:
@@ -1962,7 +1975,7 @@ async def get_interested_remotes(
     store: DataStore,
     presence_router: PresenceRouter,
     states: List[UserPresenceState],
-) -> List[Tuple[Collection[str], List[UserPresenceState]]]:
+) -> Dict[str, Set[UserPresenceState]]:
     """Given a list of presence states figure out which remote servers
     should be sent which.
 
@@ -1974,11 +1987,9 @@ async def get_interested_remotes(
         states: A list of incoming user presence updates.
 
     Returns:
-        A list of 2-tuples of destinations and states, where for
-        each tuple the list of UserPresenceState should be sent to each
-        destination
+        A map from destinations to presence states to send to that destination.
     """
-    hosts_and_states = []  # type: List[Tuple[Collection[str], List[UserPresenceState]]]
+    hosts_and_states: Dict[str, Set[UserPresenceState]] = {}
 
     # First we look up the rooms each user is in (as well as any explicit
     # subscriptions), then for each distinct room we look up the remote
@@ -1990,11 +2001,12 @@ async def get_interested_remotes(
     for room_id, states in room_ids_to_states.items():
         user_ids = await store.get_users_in_room(room_id)
         hosts = {get_domain_from_id(user_id) for user_id in user_ids}
-        hosts_and_states.append((hosts, states))
+        for host in hosts:
+            hosts_and_states.setdefault(host, set()).update(states)
 
     for user_id, states in users_to_states.items():
         host = get_domain_from_id(user_id)
-        hosts_and_states.append(([host], states))
+        hosts_and_states.setdefault(host, set()).update(states)
 
     return hosts_and_states
 
diff --git a/synapse/storage/databases/main/presence.py b/synapse/storage/databases/main/presence.py
index 6a2baa7841..1388771c40 100644
--- a/synapse/storage/databases/main/presence.py
+++ b/synapse/storage/databases/main/presence.py
@@ -50,7 +50,7 @@ class PresenceStore(SQLBaseStore):
                 instance_name=self._instance_name,
                 tables=[("presence_stream", "instance_name", "stream_id")],
                 sequence_name="presence_stream_sequence",
-                writers=hs.config.worker.writers.to_device,
+                writers=hs.config.worker.writers.presence,
             )
         else:
             self._presence_id_gen = StreamIdGenerator(
diff --git a/synapse/storage/util/id_generators.py b/synapse/storage/util/id_generators.py
index b1bd3a52d9..f1e62f9e85 100644
--- a/synapse/storage/util/id_generators.py
+++ b/synapse/storage/util/id_generators.py
@@ -397,6 +397,11 @@ class MultiWriterIdGenerator:
                 # ... persist event ...
         """
 
+        # If we have a list of instances that are allowed to write to this
+        # stream, make sure we're in it.
+        if self._writers and self._instance_name not in self._writers:
+            raise Exception("Tried to allocate stream ID on non-writer")
+
         return _MultiWriterCtxManager(self)
 
     def get_next_mult(self, n: int):
@@ -406,6 +411,11 @@ class MultiWriterIdGenerator:
                 # ... persist events ...
         """
 
+        # If we have a list of instances that are allowed to write to this
+        # stream, make sure we're in it.
+        if self._writers and self._instance_name not in self._writers:
+            raise Exception("Tried to allocate stream ID on non-writer")
+
         return _MultiWriterCtxManager(self, n)
 
     def get_next_txn(self, txn: LoggingTransaction):
@@ -416,6 +426,11 @@ class MultiWriterIdGenerator:
             # ... persist event ...
         """
 
+        # If we have a list of instances that are allowed to write to this
+        # stream, make sure we're in it.
+        if self._writers and self._instance_name not in self._writers:
+            raise Exception("Tried to allocate stream ID on non-writer")
+
         next_id = self._load_next_id_txn(txn)
 
         with self._lock: