diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index ff83c608e7..c2df43e2f6 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -345,19 +345,21 @@ class FederationHandler(BaseHandler):
)
missing_auth = required_auth - set(auth_events)
- results = yield defer.gatherResults(
- [
- self.replication_layer.get_pdu(
- [dest],
- event_id,
- outlier=True,
- timeout=10000,
- )
- for event_id in missing_auth
- ],
- consumeErrors=True
- ).addErrback(unwrapFirstError)
- auth_events.update({a.event_id: a for a in results})
+ if missing_auth:
+ logger.info("Missing auth for backfill: %r", missing_auth)
+ results = yield defer.gatherResults(
+ [
+ self.replication_layer.get_pdu(
+ [dest],
+ event_id,
+ outlier=True,
+ timeout=10000,
+ )
+ for event_id in missing_auth
+ ],
+ consumeErrors=True
+ ).addErrback(unwrapFirstError)
+ auth_events.update({a.event_id: a for a in results})
ev_infos = []
for a in auth_events.values():
@@ -399,7 +401,7 @@ class FederationHandler(BaseHandler):
# previous to work out the state.
# TODO: We can probably do something more clever here.
yield self._handle_new_event(
- dest, event
+ dest, event, backfilled=True,
)
defer.returnValue(events)
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