Revert "Add experimental support for sharding event persister. (#8170)" (#8242)

* Revert "Add experimental support for sharding event persister. (#8170)"

This reverts commit 82c1ee1c22.

* Changelog

synapse/replication/http/federation.py

@@ -65,11 +65,10 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
         self.federation_handler = hs.get_handlers().federation_handler
 
     @staticmethod
-    async def _serialize_payload(store, room_id, event_and_contexts, backfilled):
+    async def _serialize_payload(store, event_and_contexts, backfilled):
         """
         Args:
             store
-            room_id (str)
             event_and_contexts (list[tuple[FrozenEvent, EventContext]])
             backfilled (bool): Whether or not the events are the result of
                 backfilling
@@ -89,11 +88,7 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
                 }
             )
 
-        payload = {
-            "events": event_payloads,
-            "backfilled": backfilled,
-            "room_id": room_id,
-        }
+        payload = {"events": event_payloads, "backfilled": backfilled}
 
         return payload
 
@@ -101,7 +96,6 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
         with Measure(self.clock, "repl_fed_send_events_parse"):
             content = parse_json_object_from_request(request)
 
-            room_id = content["room_id"]
             backfilled = content["backfilled"]
 
             event_payloads = content["events"]
@@ -126,7 +120,7 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
         logger.info("Got %d events from federation", len(event_and_contexts))
 
         max_stream_id = await self.federation_handler.persist_events_and_notify(
-            room_id, event_and_contexts, backfilled
+            event_and_contexts, backfilled
         )
 
         return 200, {"max_stream_id": max_stream_id}

synapse/replication/tcp/handler.py

@@ -109,7 +109,7 @@ class ReplicationCommandHandler:
             if isinstance(stream, (EventsStream, BackfillStream)):
                 # Only add EventStream and BackfillStream as a source on the
                 # instance in charge of event persistence.
-                if hs.get_instance_name() in hs.config.worker.writers.events:
+                if hs.config.worker.writers.events == hs.get_instance_name():
                     self._streams_to_replicate.append(stream)
 
                 continue

synapse/replication/tcp/streams/events.py

@@ -19,7 +19,7 @@ from typing import List, Tuple, Type
 
 import attr
 
-from ._base import Stream, StreamUpdateResult, Token
+from ._base import Stream, StreamUpdateResult, Token, current_token_without_instance
 
 """Handling of the 'events' replication stream
 
@@ -117,7 +117,7 @@ class EventsStream(Stream):
         self._store = hs.get_datastore()
         super().__init__(
             hs.get_instance_name(),
-            self._store._stream_id_gen.get_current_token_for_writer,
+            current_token_without_instance(self._store.get_current_events_token),
             self._update_function,
         )