1 files changed, 15 insertions, 0 deletions
diff --git a/synapse/federation/sender/per_destination_queue.py b/synapse/federation/sender/per_destination_queue.py
index 4e698981a4..1093ae0d91 100644
--- a/synapse/federation/sender/per_destination_queue.py
+++ b/synapse/federation/sender/per_destination_queue.py
@@ -15,6 +15,7 @@
# limitations under the License.
import datetime
import logging
+import random
from typing import TYPE_CHECKING, Dict, Hashable, Iterable, List, Tuple
from prometheus_client import Counter
@@ -39,6 +40,8 @@ if TYPE_CHECKING:
# This is defined in the Matrix spec and enforced by the receiver.
MAX_EDUS_PER_TRANSACTION = 100
+DEPRIORITISE_SLEEP_TIME = 10
+
logger = logging.getLogger(__name__)
@@ -199,6 +202,18 @@ class PerDestinationQueue(object):
pending_pdus = []
while True:
+ if self._transaction_manager.deprioritise_transmission:
+ # if the event-processing loop has got behind, sleep to give it
+ # a chance to catch up. Add some randomness so that the transmitters
+ # don't all wake up in sync.
+ sleeptime = random.uniform(
+ DEPRIORITISE_SLEEP_TIME, DEPRIORITISE_SLEEP_TIME * 2
+ )
+ logger.info(
+ "TX [%s]: sleeping for %f seconds", self._destination, sleeptime
+ )
+ await self._clock.sleep(sleeptime)
+
# We have to keep 2 free slots for presence and rr_edus
limit = MAX_EDUS_PER_TRANSACTION - 2
|
