diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py
index 552519e82c..41a726878d 100644
--- a/synapse/federation/sender/__init__.py
+++ b/synapse/federation/sender/__init__.py
@@ -209,7 +209,7 @@ class FederationSender:
logger.debug("Sending %s to %r", event, destinations)
if destinations:
- self._send_pdu(event, destinations)
+ await self._send_pdu(event, destinations)
now = self.clock.time_msec()
ts = await self.store.get_received_ts(event.event_id)
@@ -265,7 +265,7 @@ class FederationSender:
finally:
self._is_processing = False
- def _send_pdu(self, pdu: EventBase, destinations: Iterable[str]) -> None:
+ 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.
@@ -280,6 +280,13 @@ class FederationSender:
sent_pdus_destination_dist_total.inc(len(destinations))
sent_pdus_destination_dist_count.inc()
+ # 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:
self._get_per_destination_queue(destination).send_pdu(pdu)
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