1 files changed, 13 insertions, 0 deletions
diff --git a/synapse/server.py b/synapse/server.py
index 72835e8c86..b9549dd042 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -185,6 +185,10 @@ class HomeServer(object):
         'registration_handler',
     ]
 
+    REQUIRED_ON_MASTER_STARTUP = [
+        "user_directory_handler",
+    ]
+
     # This is overridden in derived application classes
     # (such as synapse.app.homeserver.SynapseHomeServer) and gives the class to be
     # instantiated during setup() for future return by get_datastore()
@@ -221,6 +225,15 @@ class HomeServer(object):
             conn.commit()
         logger.info("Finished setting up.")
 
+    def setup_master(self):
+        """
+        Some handlers have side effects on instantiation (like registering
+        background updates). This function causes them to be fetched, and
+        therefore instantiated, to run those side effects.
+        """
+        for i in self.REQUIRED_ON_MASTER_STARTUP:
+            getattr(self, "get_" + i)()
+
     def get_reactor(self):
         """
         Fetch the Twisted reactor in use by this HomeServer.