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-rw-r--r--synapse/replication/tcp/client.py6
-rw-r--r--synapse/replication/tcp/commands.py10
-rw-r--r--synapse/replication/tcp/protocol.py6
-rw-r--r--synapse/replication/tcp/resource.py12
4 files changed, 16 insertions, 18 deletions
diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py
index 7e7ad0f798..e86d9805f1 100644
--- a/synapse/replication/tcp/client.py
+++ b/synapse/replication/tcp/client.py
@@ -189,10 +189,12 @@ class ReplicationClientHandler(AbstractReplicationClientHandler):
         """
         self.send_command(FederationAckCommand(token))
 
-    def send_user_sync(self, user_id, is_syncing, last_sync_ms):
+    def send_user_sync(self, instance_id, user_id, is_syncing, last_sync_ms):
         """Poke the master that a user has started/stopped syncing.
         """
-        self.send_command(UserSyncCommand(user_id, is_syncing, last_sync_ms))
+        self.send_command(
+            UserSyncCommand(instance_id, user_id, is_syncing, last_sync_ms)
+        )
 
     def send_remove_pusher(self, app_id, push_key, user_id):
         """Poke the master to remove a pusher for a user
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index 5a6b734094..fe3668838b 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -207,30 +207,32 @@ class UserSyncCommand(Command):
 
     Format::
 
-        USER_SYNC <user_id> <state> <last_sync_ms>
+        USER_SYNC <instance_id> <user_id> <state> <last_sync_ms>
 
     Where <state> is either "start" or "stop"
     """
 
     NAME = "USER_SYNC"
 
-    def __init__(self, user_id, is_syncing, last_sync_ms):
+    def __init__(self, instance_id, user_id, is_syncing, last_sync_ms):
+        self.instance_id = instance_id
         self.user_id = user_id
         self.is_syncing = is_syncing
         self.last_sync_ms = last_sync_ms
 
     @classmethod
     def from_line(cls, line):
-        user_id, state, last_sync_ms = line.split(" ", 2)
+        instance_id, user_id, state, last_sync_ms = line.split(" ", 3)
 
         if state not in ("start", "end"):
             raise Exception("Invalid USER_SYNC state %r" % (state,))
 
-        return cls(user_id, state == "start", int(last_sync_ms))
+        return cls(instance_id, user_id, state == "start", int(last_sync_ms))
 
     def to_line(self):
         return " ".join(
             (
+                self.instance_id,
                 self.user_id,
                 "start" if self.is_syncing else "end",
                 str(self.last_sync_ms),
diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py
index e266c72417..8b9d65362b 100644
--- a/synapse/replication/tcp/protocol.py
+++ b/synapse/replication/tcp/protocol.py
@@ -419,7 +419,7 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol):
 
     async def on_USER_SYNC(self, cmd):
         await self.streamer.on_user_sync(
-            self.conn_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms
+            cmd.instance_id, cmd.user_id, cmd.is_syncing, cmd.last_sync_ms
         )
 
     async def on_REPLICATE(self, cmd):
@@ -547,6 +547,8 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
     ):
         BaseReplicationStreamProtocol.__init__(self, clock)
 
+        self.instance_id = hs.get_instance_id()
+
         self.client_name = client_name
         self.server_name = server_name
         self.handler = handler
@@ -576,7 +578,7 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
         currently_syncing = self.handler.get_currently_syncing_users()
         now = self.clock.time_msec()
         for user_id in currently_syncing:
-            self.send_command(UserSyncCommand(user_id, True, now))
+            self.send_command(UserSyncCommand(self.instance_id, user_id, True, now))
 
         # We've now finished connecting to so inform the client handler
         self.handler.update_connection(self)
diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py
index 757129b6d5..8d720694e9 100644
--- a/synapse/replication/tcp/resource.py
+++ b/synapse/replication/tcp/resource.py
@@ -246,12 +246,12 @@ class ReplicationStreamer(object):
             self.federation_sender.federation_ack(token)
 
     @measure_func("repl.on_user_sync")
-    async def on_user_sync(self, conn_id, user_id, is_syncing, last_sync_ms):
+    async def on_user_sync(self, instance_id, user_id, is_syncing, last_sync_ms):
         """A client has started/stopped syncing on a worker.
         """
         user_sync_counter.inc()
         await self.presence_handler.update_external_syncs_row(
-            conn_id, user_id, is_syncing, last_sync_ms
+            instance_id, user_id, is_syncing, last_sync_ms
         )
 
     @measure_func("repl.on_remove_pusher")
@@ -316,14 +316,6 @@ class ReplicationStreamer(object):
         except ValueError:
             pass
 
-        # We need to tell the presence handler that the connection has been
-        # lost so that it can handle any ongoing syncs on that connection.
-        run_as_background_process(
-            "update_external_syncs_clear",
-            self.presence_handler.update_external_syncs_clear,
-            connection.conn_id,
-        )
-
 
 def _batch_updates(updates):
     """Takes a list of updates of form [(token, row)] and sets the token to