diff --git a/synapse/replication/http/registration.py b/synapse/replication/http/registration.py
new file mode 100644
index 0000000000..5030bde499
--- /dev/null
+++ b/synapse/replication/http/registration.py
@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+
+from twisted.internet import defer
+
+from synapse.events import event_type_from_format_version
+from synapse.events.snapshot import EventContext
+from synapse.http.servlet import parse_json_object_from_request
+from synapse.replication.http._base import ReplicationEndpoint
+from synapse.types import Requester, UserID
+from synapse.util.metrics import Measure
+
+logger = logging.getLogger(__name__)
+
+
+class RegistrationUserCacheInvalidationServlet(ReplicationEndpoint):
+ """
+ Invalidate the caches that a registration usually invalidates.
+
+ Request format:
+
+ POST /_synapse/replication/fed_query/:fed_cleanup_room/:txn_id
+
+ {}
+ """
+
+ NAME = "reg_invalidate_user_caches"
+ PATH_ARGS = ("user_id",)
+
+ def __init__(self, hs):
+ super(RegistrationUserCacheInvalidationServlet, self).__init__(hs)
+ self.store = hs.get_datastore()
+
+ @staticmethod
+ def _serialize_payload(user_id, args):
+ """
+ Args:
+ user_id (str)
+ """
+ return {}
+
+ @defer.inlineCallbacks
+ def _handle_request(self, request, user_id):
+
+ def invalidate(txn):
+ self.store._invalidate_cache_and_stream(
+ txn, self.store.get_user_by_id, (user_id,)
+ )
+ txn.call_after(self.store.is_guest.invalidate, (user_id,))
+
+ yield self.store.runInteraction("user_invalidate_caches", invalidate)
+ defer.returnValue((200, {}))
+
+
+def register_servlets(hs, http_server):
+ RegistrationUserCacheInvalidationServlet(hs).register(http_server)
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