diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index ff6bb475b5..328f8f4842 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -274,7 +274,7 @@ class FederationHandler(BaseHandler):
@log_function
@defer.inlineCallbacks
- def backfill(self, dest, room_id, limit, extremities=[]):
+ def backfill(self, dest, room_id, limit, extremities):
""" Trigger a backfill request to `dest` for the given `room_id`
This will attempt to get more events from the remote. This may return
@@ -284,9 +284,6 @@ class FederationHandler(BaseHandler):
if dest == self.server_name:
raise SynapseError(400, "Can't backfill from self.")
- if not extremities:
- extremities = yield self.store.get_oldest_events_in_room(room_id)
-
events = yield self.replication_layer.backfill(
dest,
room_id,
@@ -455,6 +452,10 @@ class FederationHandler(BaseHandler):
)
max_depth = sorted_extremeties_tuple[0][1]
+ # We don't want to specify too many extremities as it causes the backfill
+ # request URI to be too long.
+ extremities = dict(sorted_extremeties_tuple[:5])
+
if current_depth > max_depth:
logger.debug(
"Not backfilling as we don't need to. %d < %d",
|
