Don't wake up destination transaction queue if they're not due for retry.

changelog.d/16223.feature

@@ -0,0 +1 @@
+Improve resource usage when sending data to a large number of remote hosts that are marked as "down".

synapse/federation/send_queue.py

@@ -49,7 +49,7 @@
 from synapse.federation.sender import AbstractFederationSender, FederationSender
 from synapse.metrics import LaterGauge
 from synapse.replication.tcp.streams.federation import FederationStream
-from synapse.types import JsonDict, ReadReceipt, RoomStreamToken
+from synapse.types import JsonDict, ReadReceipt, RoomStreamToken, StrCollection
 from synapse.util.metrics import Measure
 
 from .units import Edu
@@ -229,7 +229,7 @@ async def send_read_receipt(self, receipt: ReadReceipt) -> None:
         """
         # nothing to do here: the replication listener will handle it.
 
-    def send_presence_to_destinations(
+    async def send_presence_to_destinations(
         self, states: Iterable[UserPresenceState], destinations: Iterable[str]
     ) -> None:
         """As per FederationSender
@@ -245,7 +245,9 @@ def send_presence_to_destinations(
 
         self.notifier.on_new_replication_data()
 
-    def send_device_messages(self, destination: str, immediate: bool = True) -> None:
+    async def send_device_messages(
+        self, destinations: StrCollection, immediate: bool = True
+    ) -> None:
         """As per FederationSender"""
         # We don't need to replicate this as it gets sent down a different
         # stream.
@@ -463,7 +465,7 @@ class ParsedFederationStreamData:
     edus: Dict[str, List[Edu]]
 
 
-def process_rows_for_federation(
+async def process_rows_for_federation(
     transaction_queue: FederationSender,
     rows: List[FederationStream.FederationStreamRow],
 ) -> None:
@@ -496,7 +498,7 @@ def process_rows_for_federation(
         parsed_row.add_to_buffer(buff)
 
     for state, destinations in buff.presence_destinations:
-        transaction_queue.send_presence_to_destinations(
+        await transaction_queue.send_presence_to_destinations(
             states=[state], destinations=destinations
         )
 

synapse/federation/sender/__init__.py

@@ -147,7 +147,10 @@
 import synapse.metrics
 from synapse.api.presence import UserPresenceState
 from synapse.events import EventBase
-from synapse.federation.sender.per_destination_queue import PerDestinationQueue
+from synapse.federation.sender.per_destination_queue import (
+    CATCHUP_RETRY_INTERVAL,
+    PerDestinationQueue,
+)
 from synapse.federation.sender.transaction_manager import TransactionManager
 from synapse.federation.units import Edu
 from synapse.logging.context import make_deferred_yieldable, run_in_background
@@ -161,9 +164,10 @@
     run_as_background_process,
     wrap_as_background_process,
 )
-from synapse.types import JsonDict, ReadReceipt, RoomStreamToken
+from synapse.types import JsonDict, ReadReceipt, RoomStreamToken, StrCollection
 from synapse.util import Clock
 from synapse.util.metrics import Measure
+from synapse.util.retryutils import filter_destinations_by_retry_limiter
 
 if TYPE_CHECKING:
     from synapse.events.presence_router import PresenceRouter
@@ -213,7 +217,7 @@ async def send_read_receipt(self, receipt: ReadReceipt) -> None:
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def send_presence_to_destinations(
+    async def send_presence_to_destinations(
         self, states: Iterable[UserPresenceState], destinations: Iterable[str]
     ) -> None:
         """Send the given presence states to the given destinations.
@@ -242,9 +246,11 @@ def build_and_send_edu(
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def send_device_messages(self, destination: str, immediate: bool = True) -> None:
+    async def send_device_messages(
+        self, destinations: StrCollection, immediate: bool = True
+    ) -> None:
         """Tells the sender that a new device message is ready to be sent to the
-        destination. The `immediate` flag specifies whether the messages should
+        destinations. The `immediate` flag specifies whether the messages should
         be tried to be sent immediately, or whether it can be delayed for a
         short while (to aid performance).
         """
@@ -716,6 +722,13 @@ async def _send_pdu(self, pdu: EventBase, destinations: Iterable[str]) -> None:
             pdu.internal_metadata.stream_ordering,
         )
 
+        destinations = await filter_destinations_by_retry_limiter(
+            destinations,
+            clock=self.clock,
+            store=self.store,
+            retry_due_within_ms=CATCHUP_RETRY_INTERVAL,
+        )
+
         for destination in destinations:
             self._get_per_destination_queue(destination).send_pdu(pdu)
 
@@ -763,12 +776,20 @@ async def send_read_receipt(self, receipt: ReadReceipt) -> None:
         domains_set = await self._storage_controllers.state.get_current_hosts_in_room_or_partial_state_approximation(
             room_id
         )
-        domains = [
+        domains: StrCollection = [
             d
             for d in domains_set
             if not self.is_mine_server_name(d)
             and self._federation_shard_config.should_handle(self._instance_name, d)
         ]
+
+        domains = await filter_destinations_by_retry_limiter(
+            domains,
+            clock=self.clock,
+            store=self.store,
+            retry_due_within_ms=CATCHUP_RETRY_INTERVAL,
+        )
+
         if not domains:
             return
 
@@ -816,7 +837,7 @@ def _flush_rrs_for_room(self, room_id: str) -> None:
         for queue in queues:
             queue.flush_read_receipts_for_room(room_id)
 
-    def send_presence_to_destinations(
+    async def send_presence_to_destinations(
         self, states: Iterable[UserPresenceState], destinations: Iterable[str]
     ) -> None:
         """Send the given presence states to the given destinations.
@@ -831,13 +852,20 @@ def send_presence_to_destinations(
         for state in states:
             assert self.is_mine_id(state.user_id)
 
+        destinations = await filter_destinations_by_retry_limiter(
+            [
+                d
+                for d in destinations
+                if self._federation_shard_config.should_handle(self._instance_name, d)
+            ],
+            clock=self.clock,
+            store=self.store,
+            retry_due_within_ms=CATCHUP_RETRY_INTERVAL,
+        )
+
         for destination in destinations:
             if self.is_mine_server_name(destination):
                 continue
-            if not self._federation_shard_config.should_handle(
-                self._instance_name, destination
-            ):
-                continue
 
             self._get_per_destination_queue(destination).send_presence(
                 states, start_loop=False
@@ -896,21 +924,29 @@ def send_edu(self, edu: Edu, key: Optional[Hashable]) -> None:
         else:
             queue.send_edu(edu)
 
-    def send_device_messages(self, destination: str, immediate: bool = True) -> None:
-        if self.is_mine_server_name(destination):
-            logger.warning("Not sending device update to ourselves")
-            return
-
-        if not self._federation_shard_config.should_handle(
-            self._instance_name, destination
-        ):
-            return
+    async def send_device_messages(
+        self, destinations: StrCollection, immediate: bool = True
+    ) -> None:
+        destinations = await filter_destinations_by_retry_limiter(
+            [
+                destination
+                for destination in destinations
+                if self._federation_shard_config.should_handle(
+                    self._instance_name, destination
+                )
+                and not self.is_mine_server_name(destination)
+            ],
+            clock=self.clock,
+            store=self.store,
+            retry_due_within_ms=CATCHUP_RETRY_INTERVAL,
+        )
 
-        if immediate:
-            self._get_per_destination_queue(destination).attempt_new_transaction()
-        else:
-            self._get_per_destination_queue(destination).mark_new_data()
-            self._destination_wakeup_queue.add_to_queue(destination)
+        for destination in destinations:
+            if immediate:
+                self._get_per_destination_queue(destination).attempt_new_transaction()
+            else:
+                self._get_per_destination_queue(destination).mark_new_data()
+                self._destination_wakeup_queue.add_to_queue(destination)
 
     def wake_destination(self, destination: str) -> None:
         """Called when we want to retry sending transactions to a remote.

synapse/federation/sender/per_destination_queue.py

@@ -59,6 +59,10 @@
 )
 
 
+# If the retry interval is larger than this then we enter "catchup" mode
+CATCHUP_RETRY_INTERVAL = 60 * 60 * 1000
+
+
 class PerDestinationQueue:
     """
     Manages the per-destination transmission queues.
@@ -370,7 +374,7 @@ async def _transaction_transmission_loop(self) -> None:
                 ),
             )
 
-            if e.retry_interval > 60 * 60 * 1000:
+            if e.retry_interval > CATCHUP_RETRY_INTERVAL:
                 # we won't retry for another hour!
                 # (this suggests a significant outage)
                 # We drop pending EDUs because otherwise they will

synapse/handlers/device.py

@@ -836,17 +836,16 @@ async def _handle_new_device_update_async(self) -> None:
                             user_id,
                             hosts,
                         )
-                        for host in hosts:
-                            self.federation_sender.send_device_messages(
-                                host, immediate=False
-                            )
-                            # TODO: when called, this isn't in a logging context.
-                            # This leads to log spam, sentry event spam, and massive
-                            # memory usage.
-                            # See https://github.com/matrix-org/synapse/issues/12552.
-                            # log_kv(
-                            #     {"message": "sent device update to host", "host": host}
-                            # )
+                        await self.federation_sender.send_device_messages(
+                            hosts, immediate=False
+                        )
+                        # TODO: when called, this isn't in a logging context.
+                        # This leads to log spam, sentry event spam, and massive
+                        # memory usage.
+                        # See https://github.com/matrix-org/synapse/issues/12552.
+                        # log_kv(
+                        #     {"message": "sent device update to host", "host": host}
+                        # )
 
                     if current_stream_id != stream_id:
                         # Clear the set of hosts we've already sent to as we're
@@ -951,8 +950,9 @@ async def handle_room_un_partial_stated(self, room_id: str) -> None:
 
         # Notify things that device lists need to be sent out.
         self.notifier.notify_replication()
-        for host in potentially_changed_hosts:
-            self.federation_sender.send_device_messages(host, immediate=False)
+        await self.federation_sender.send_device_messages(
+            potentially_changed_hosts, immediate=False
+        )
 
 
 def _update_device_from_client_ips(

synapse/handlers/devicemessage.py

@@ -302,10 +302,9 @@ async def send_device_message(
         )
 
         if self.federation_sender:
-            for destination in remote_messages.keys():
-                # Enqueue a new federation transaction to send the new
-                # device messages to each remote destination.
-                self.federation_sender.send_device_messages(destination)
+            # Enqueue a new federation transaction to send the new
+            # device messages to each remote destination.
+            await self.federation_sender.send_device_messages(remote_messages.keys())
 
     async def get_events_for_dehydrated_device(
         self,

synapse/handlers/presence.py

@@ -354,7 +354,9 @@ async def maybe_send_presence_to_interested_destinations(
         )
 
         for destination, host_states in hosts_to_states.items():
-            self._federation.send_presence_to_destinations(host_states, [destination])
+            await self._federation.send_presence_to_destinations(
+                host_states, [destination]
+            )
 
     async def send_full_presence_to_users(self, user_ids: StrCollection) -> None:
         """
@@ -936,7 +938,7 @@ async def _update_states(
                 )
 
                 for destination, states in hosts_to_states.items():
-                    self._federation_queue.send_presence_to_destinations(
+                    await self._federation_queue.send_presence_to_destinations(
                         states, [destination]
                     )
 
@@ -1508,7 +1510,7 @@ async def _handle_state_delta(self, room_id: str, deltas: List[JsonDict]) -> Non
                 or state.status_msg is not None
             ]
 
-            self._federation_queue.send_presence_to_destinations(
+            await self._federation_queue.send_presence_to_destinations(
                 destinations=newly_joined_remote_hosts,
                 states=states,
             )
@@ -1519,7 +1521,7 @@ async def _handle_state_delta(self, room_id: str, deltas: List[JsonDict]) -> Non
             prev_remote_hosts or newly_joined_remote_hosts
         ):
             local_states = await self.current_state_for_users(newly_joined_local_users)
-            self._federation_queue.send_presence_to_destinations(
+            await self._federation_queue.send_presence_to_destinations(
                 destinations=prev_remote_hosts | newly_joined_remote_hosts,
                 states=list(local_states.values()),
             )
@@ -2182,7 +2184,7 @@ def _clear_queue(self) -> None:
         index = bisect(self._queue, (clear_before,))
         self._queue = self._queue[index:]
 
-    def send_presence_to_destinations(
+    async def send_presence_to_destinations(
         self, states: Collection[UserPresenceState], destinations: StrCollection
     ) -> None:
         """Send the presence states to the given destinations.
@@ -2202,7 +2204,7 @@ def send_presence_to_destinations(
             return
 
         if self._federation:
-            self._federation.send_presence_to_destinations(
+            await self._federation.send_presence_to_destinations(
                 states=states,
                 destinations=destinations,
             )
@@ -2325,7 +2327,7 @@ async def process_replication_rows(
 
         for host, user_ids in hosts_to_users.items():
             states = await self._presence_handler.current_state_for_users(user_ids)
-            self._federation.send_presence_to_destinations(
+            await self._federation.send_presence_to_destinations(
                 states=states.values(),
                 destinations=[host],
             )

synapse/handlers/typing.py

@@ -26,9 +26,10 @@
 )
 from synapse.replication.tcp.streams import TypingStream
 from synapse.streams import EventSource
-from synapse.types import JsonDict, Requester, StreamKeyType, UserID
+from synapse.types import JsonDict, Requester, StrCollection, StreamKeyType, UserID
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 from synapse.util.metrics import Measure
+from synapse.util.retryutils import filter_destinations_by_retry_limiter
 from synapse.util.wheel_timer import WheelTimer
 
 if TYPE_CHECKING:
@@ -150,8 +151,15 @@ async def _push_remote(self, member: RoomMember, typing: bool) -> None:
                 now=now, obj=member, then=now + FEDERATION_PING_INTERVAL
             )
 
-            hosts = await self._storage_controllers.state.get_current_hosts_in_room(
-                member.room_id
+            hosts: StrCollection = (
+                await self._storage_controllers.state.get_current_hosts_in_room(
+                    member.room_id
+                )
+            )
+            hosts = await filter_destinations_by_retry_limiter(
+                hosts,
+                clock=self.clock,
+                store=self.store,
             )
             for domain in hosts:
                 if not self.is_mine_server_name(domain):

synapse/module_api/__init__.py

@@ -1180,7 +1180,7 @@ async def send_local_online_presence_to(self, users: Iterable[str]) -> None:
 
             # Send to remote destinations.
             destination = UserID.from_string(user).domain
-            presence_handler.get_federation_queue().send_presence_to_destinations(
+            await presence_handler.get_federation_queue().send_presence_to_destinations(
                 presence_events, [destination]
             )