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Limit number of extremeties in backfill request

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This works around a bug where if we make a backfill request with too
many extremeties it causes the request URI to be too long.
This commit is contained in:
Erik Johnston 2016-08-16 11:34:36 +01:00
parent 6cbd1b495e
commit 2ee1bd124c
1 changed files with 5 additions and 4 deletions
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9
synapse/handlers/federation.py
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@ -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",