add comment to cleaning requests list in view change.
@@ -597,6 +597,10 @@ class Node(HasActionQueue, Motor, Propagator, MessageProcessor, HasFileStorage,
self.master_replica.on_propagate_primary_done()
self.view_changer.last_completed_view_no = self.view_changer.view_no
# Remove already ordered requests from requests list after view change
+ # If view change happen when one half of nodes ordered on master
+ # instance and backup but other only on master then we need to clear
+ # requests list. We do this to stop transactions ordering on backup
+ # replicas that have already been ordered on master.
for replica in self.replicas:
replica.clear_requests_and_fix_last_ordered()
