From 2c4908ed268c7ae07af2b829c34d18ed5d743b81 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Sun, 24 Aug 2014 14:35:13 +0100
Subject: [PATCH] Ensure that we don't have duplicate hosts in the pdu
 destinations list

---
 synapse/federation/replication.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/synapse/federation/replication.py b/synapse/federation/replication.py
index 8030d0963..cf634a64b 100644
--- a/synapse/federation/replication.py
+++ b/synapse/federation/replication.py
@@ -509,10 +509,10 @@ class _TransactionQueue(object):
         # a transaction in progress. If we do, stick it in the pending_pdus
         # table and we'll get back to it later.
 
-        destinations = [
+        destinations = set([
             d for d in pdu.destinations
             if d != self.server_name
-        ]
+        ])
 
         logger.debug("Sending to: %s", str(destinations))