diff --git a/synapse/replication/slave/storage/devices.py b/synapse/replication/slave/storage/devices.py
new file mode 100644
index 0000000000..ca46aa17b6
--- /dev/null
+++ b/synapse/replication/slave/storage/devices.py
@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 OpenMarket 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.
+
+from ._base import BaseSlavedStore
+from ._slaved_id_tracker import SlavedIdTracker
+from synapse.storage import DataStore
+from synapse.util.caches.stream_change_cache import StreamChangeCache
+
+
+class SlavedDeviceStore(BaseSlavedStore):
+ def __init__(self, db_conn, hs):
+ super(SlavedDeviceStore, self).__init__(db_conn, hs)
+
+ self.hs = hs
+
+ self._device_list_id_gen = SlavedIdTracker(
+ db_conn, "device_lists_stream", "stream_id",
+ )
+ device_list_max = self._device_list_id_gen.get_current_token()
+ self._device_list_stream_cache = StreamChangeCache(
+ "DeviceListStreamChangeCache", device_list_max,
+ )
+ self._device_list_federation_stream_cache = StreamChangeCache(
+ "DeviceListFederationStreamChangeCache", device_list_max,
+ )
+
+ get_device_stream_token = DataStore.get_device_stream_token.__func__
+ get_user_whose_devices_changed = DataStore.get_user_whose_devices_changed.__func__
+ get_devices_by_remote = DataStore.get_devices_by_remote.__func__
+ _get_devices_by_remote_txn = DataStore._get_devices_by_remote_txn.__func__
+ _get_e2e_device_keys_txn = DataStore._get_e2e_device_keys_txn.__func__
+ mark_as_sent_devices_by_remote = DataStore.mark_as_sent_devices_by_remote.__func__
+ _mark_as_sent_devices_by_remote_txn = (
+ DataStore._mark_as_sent_devices_by_remote_txn.__func__
+ )
+
+ def stream_positions(self):
+ result = super(SlavedDeviceStore, self).stream_positions()
+ result["device_lists"] = self._device_list_id_gen.get_current_token()
+ return result
+
+ def process_replication(self, result):
+ stream = result.get("device_lists")
+ if stream:
+ self._device_list_id_gen.advance(int(stream["position"]))
+ for row in stream["rows"]:
+ stream_id = row[0]
+ user_id = row[1]
+ destination = row[2]
+
+ self._device_list_stream_cache.entity_has_changed(
+ user_id, stream_id
+ )
+
+ if destination:
+ self._device_list_federation_stream_cache.entity_has_changed(
+ destination, stream_id
+ )
+
+ return super(SlavedDeviceStore, self).process_replication(result)
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