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Revert "Experimental Federation Speedup (#9702)"

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This reverts commit 05e8c70c05.
This commit is contained in:
Andrew Morgan 2021-04-28 11:04:38 +01:00
parent fe604a022a
commit 4e0fd35bc9
5 changed files with 91 additions and 136 deletions
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1
changelog.d/9702.misc
View File

@ -1 +0,0 @@
Speed up federation transmission by using fewer database calls. Contributed by @ShadowJonathan.

10
contrib/experiments/test_messaging.py
View File

@ -224,8 +224,7 @@ class HomeServer(ReplicationHandler):
destinations = yield self.get_servers_for_context(room_name)
try:
yield self.replication_layer.send_pdus(
[
yield self.replication_layer.send_pdu(
Pdu.create_new(
context=room_name,
pdu_type="sy.room.message",
@ -233,7 +232,6 @@ class HomeServer(ReplicationHandler):
origin=self.server_name,
destinations=destinations,
)
]
)
except Exception as e:
logger.exception(e)
@ -255,7 +253,7 @@ class HomeServer(ReplicationHandler):
origin=self.server_name,
destinations=destinations,
)
yield self.replication_layer.send_pdus([pdu])
yield self.replication_layer.send_pdu(pdu)
except Exception as e:
logger.exception(e)
@ -267,8 +265,7 @@ class HomeServer(ReplicationHandler):
destinations = yield self.get_servers_for_context(room_name)
try:
yield self.replication_layer.send_pdus(
[
yield self.replication_layer.send_pdu(
Pdu.create_new(
context=room_name,
is_state=True,
@ -278,7 +275,6 @@ class HomeServer(ReplicationHandler):
origin=self.server_name,
destinations=destinations,
)
]
)
except Exception as e:
logger.exception(e)

141
synapse/federation/sender/__init__.py
View File

@ -14,26 +14,19 @@
import abc
import logging
from typing import (
TYPE_CHECKING,
Collection,
Dict,
Hashable,
Iterable,
List,
Optional,
Set,
Tuple,
)
from typing import TYPE_CHECKING, Dict, Hashable, Iterable, List, Optional, Set, Tuple
from prometheus_client import Counter
from twisted.internet import defer
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.transaction_manager import TransactionManager
from synapse.federation.units import Edu
from synapse.logging.context import make_deferred_yieldable, run_in_background
from synapse.metrics import (
LaterGauge,
event_processing_loop_counter,
@ -262,27 +255,15 @@ class FederationSender(AbstractFederationSender):
if not events and next_token >= self._last_poked_id:
break
async def get_destinations_for_event(
event: EventBase,
) -> Collection[str]:
"""Computes the destinations to which this event must be sent.
This returns an empty tuple when there are no destinations to send to,
or if this event is not from this homeserver and it is not sending
it on behalf of another server.
Will also filter out destinations which this sender is not responsible for,
if multiple federation senders exist.
"""
async def handle_event(event: EventBase) -> None:
# Only send events for this server.
send_on_behalf_of = event.internal_metadata.get_send_on_behalf_of()
is_mine = self.is_mine_id(event.sender)
if not is_mine and send_on_behalf_of is None:
return ()
return
if not event.internal_metadata.should_proactively_send():
return ()
return
destinations = None # type: Optional[Set[str]]
if not event.prev_event_ids():
@ -317,7 +298,7 @@ class FederationSender(AbstractFederationSender):
"Failed to calculate hosts in room for event: %s",
event.event_id,
)
return ()
return
destinations = {
d
@ -327,15 +308,17 @@ class FederationSender(AbstractFederationSender):
)
}
destinations.discard(self.server_name)
if send_on_behalf_of is not None:
# If we are sending the event on behalf of another server
# then it already has the event and there is no reason to
# send the event to it.
destinations.discard(send_on_behalf_of)
logger.debug("Sending %s to %r", event, destinations)
if destinations:
await self._send_pdu(event, destinations)
now = self.clock.time_msec()
ts = await self.store.get_received_ts(event.event_id)
@ -343,29 +326,24 @@ class FederationSender(AbstractFederationSender):
"federation_sender"
).observe((now - ts) / 1000)
return destinations
return ()
async def handle_room_events(events: Iterable[EventBase]) -> None:
with Measure(self.clock, "handle_room_events"):
for event in events:
await handle_event(event)
async def get_federatable_events_and_destinations(
events: Iterable[EventBase],
) -> List[Tuple[EventBase, Collection[str]]]:
with Measure(self.clock, "get_destinations_for_events"):
# Fetch federation destinations per event,
# skip if get_destinations_for_event returns an empty collection,
# return list of event->destinations pairs.
return [
(event, dests)
for (event, dests) in [
(event, await get_destinations_for_event(event))
for event in events
]
if dests
]
events_by_room = {} # type: Dict[str, List[EventBase]]
for event in events:
events_by_room.setdefault(event.room_id, []).append(event)
events_and_dests = await get_federatable_events_and_destinations(events)
# Send corresponding events to each destination queue
await self._distribute_events(events_and_dests)
await make_deferred_yieldable(
defer.gatherResults(
[
run_in_background(handle_room_events, evs)
for evs in events_by_room.values()
],
consumeErrors=True,
)
)
await self.store.update_federation_out_pos("events", next_token)
@ -383,7 +361,7 @@ class FederationSender(AbstractFederationSender):
events_processed_counter.inc(len(events))
event_processing_loop_room_count.labels("federation_sender").inc(
len({event.room_id for event in events})
len(events_by_room)
)
event_processing_loop_counter.labels("federation_sender").inc()
@ -395,53 +373,34 @@ class FederationSender(AbstractFederationSender):
finally:
self._is_processing = False
async def _distribute_events(
self,
events_and_dests: Iterable[Tuple[EventBase, Collection[str]]],
) -> None:
"""Distribute events to the respective per_destination queues.
async def _send_pdu(self, pdu: EventBase, destinations: Iterable[str]) -> None:
# We loop through all destinations to see whether we already have
# a transaction in progress. If we do, stick it in the pending_pdus
# table and we'll get back to it later.
Also persists last-seen per-room stream_ordering to 'destination_rooms'.
destinations = set(destinations)
destinations.discard(self.server_name)
logger.debug("Sending to: %s", str(destinations))
Args:
events_and_dests: A list of tuples, which are (event: EventBase, destinations: Collection[str]).
Every event is paired with its intended destinations (in federation).
"""
# Tuples of room_id + destination to their max-seen stream_ordering
room_with_dest_stream_ordering = {} # type: Dict[Tuple[str, str], int]
# List of events to send to each destination
events_by_dest = {} # type: Dict[str, List[EventBase]]
# For each event-destinations pair...
for event, destinations in events_and_dests:
# (we got this from the database, it's filled)
assert event.internal_metadata.stream_ordering
if not destinations:
return
sent_pdus_destination_dist_total.inc(len(destinations))
sent_pdus_destination_dist_count.inc()
# ...iterate over those destinations..
assert pdu.internal_metadata.stream_ordering
# track the fact that we have a PDU for these destinations,
# to allow us to perform catch-up later on if the remote is unreachable
# for a while.
await self.store.store_destination_rooms_entries(
destinations,
pdu.room_id,
pdu.internal_metadata.stream_ordering,
)
for destination in destinations:
# ...update their stream-ordering...
room_with_dest_stream_ordering[(event.room_id, destination)] = max(
event.internal_metadata.stream_ordering,
room_with_dest_stream_ordering.get((event.room_id, destination), 0),
)
# ...and add the event to each destination queue.
events_by_dest.setdefault(destination, []).append(event)
# Bulk-store destination_rooms stream_ids
await self.store.bulk_store_destination_rooms_entries(
room_with_dest_stream_ordering
)
for destination, pdus in events_by_dest.items():
logger.debug("Sending %d pdus to %s", len(pdus), destination)
self._get_per_destination_queue(destination).send_pdus(pdus)
self._get_per_destination_queue(destination).send_pdu(pdu)
async def send_read_receipt(self, receipt: ReadReceipt) -> None:
"""Send a RR to any other servers in the room

15
synapse/federation/sender/per_destination_queue.py
View File

@ -154,22 +154,19 @@ class PerDestinationQueue:
+ len(self._pending_edus_keyed)
)
def send_pdus(self, pdus: Iterable[EventBase]) -> None:
"""Add PDUs to the queue, and start the transmission loop if necessary
def send_pdu(self, pdu: EventBase) -> None:
"""Add a PDU to the queue, and start the transmission loop if necessary
Args:
pdus: pdus to send
pdu: pdu to send
"""
if not self._catching_up or self._last_successful_stream_ordering is None:
# only enqueue the PDU if we are not catching up (False) or do not
# yet know if we have anything to catch up (None)
self._pending_pdus.extend(pdus)
self._pending_pdus.append(pdu)
else:
self._catchup_last_skipped = max(
pdu.internal_metadata.stream_ordering
for pdu in pdus
if pdu.internal_metadata.stream_ordering is not None
)
assert pdu.internal_metadata.stream_ordering
self._catchup_last_skipped = pdu.internal_metadata.stream_ordering
self.attempt_new_transaction()

28
synapse/storage/databases/main/transactions.py
View File

@ -14,7 +14,7 @@
import logging
from collections import namedtuple
from typing import Dict, List, Optional, Tuple
from typing import Iterable, List, Optional, Tuple
from canonicaljson import encode_canonical_json
@ -295,33 +295,37 @@ class TransactionStore(TransactionWorkerStore):
},
)
async def bulk_store_destination_rooms_entries(
self, room_and_destination_to_ordering: Dict[Tuple[str, str], int]
):
async def store_destination_rooms_entries(
self,
destinations: Iterable[str],
room_id: str,
stream_ordering: int,
) -> None:
"""
Updates or creates `destination_rooms` entries for a number of events.
Updates or creates `destination_rooms` entries in batch for a single event.
Args:
room_and_destination_to_ordering: A mapping of (room, destination) -> stream_id
destinations: list of destinations
room_id: the room_id of the event
stream_ordering: the stream_ordering of the event
"""
await self.db_pool.simple_upsert_many(
table="destinations",
key_names=("destination",),
key_values={(d,) for _, d in room_and_destination_to_ordering.keys()},
key_values=[(d,) for d in destinations],
value_names=[],
value_values=[],
desc="store_destination_rooms_entries_dests",
)
rows = [(destination, room_id) for destination in destinations]
await self.db_pool.simple_upsert_many(
table="destination_rooms",
key_names=("room_id", "destination"),
key_values=list(room_and_destination_to_ordering.keys()),
key_names=("destination", "room_id"),
key_values=rows,
value_names=["stream_ordering"],
value_values=[
(stream_id,) for stream_id in room_and_destination_to_ordering.values()
],
value_values=[(stream_ordering,)] * len(rows),
desc="store_destination_rooms_entries_rooms",
)