From 8f35f8148e1a7ce3ac249e2d2052854409f2c0d6 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Mon, 23 Oct 2023 16:57:30 +0100 Subject: Fix bug where a new writer advances their token too quickly (#16473) * Fix bug where a new writer advances their token too quickly When starting a new writer (for e.g. persisting events), the `MultiWriterIdGenerator` doesn't have a minimum token for it as there are no rows matching that new writer in the DB. This results in the the first stream ID it acquired being announced as persisted *before* it actually finishes persisting, if another writer gets and persists a subsequent stream ID. This is due to the logic of setting the minimum persisted position to the minimum known position of across all writers, and the new writer starts off not being considered. * Fix sending out POSITIONs when our token advances without update Broke in #14820 * For replication HTTP requests, only wait for minimal position --- synapse/replication/tcp/streams/federation.py | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'synapse/replication/tcp/streams/federation.py') diff --git a/synapse/replication/tcp/streams/federation.py b/synapse/replication/tcp/streams/federation.py index 4046bdec69..7f5af5852c 100644 --- a/synapse/replication/tcp/streams/federation.py +++ b/synapse/replication/tcp/streams/federation.py @@ -18,6 +18,7 @@ import attr from synapse.replication.tcp.streams._base import ( Stream, + Token, current_token_without_instance, make_http_update_function, ) @@ -47,7 +48,7 @@ class FederationStream(Stream): # will be a real FederationSender, which has stubs for current_token and # get_replication_rows.) federation_sender = hs.get_federation_sender() - current_token = current_token_without_instance( + self.current_token_func = current_token_without_instance( federation_sender.get_current_token ) update_function: Callable[ @@ -57,15 +58,21 @@ class FederationStream(Stream): elif hs.should_send_federation(): # federation sender: Query master process update_function = make_http_update_function(hs, self.NAME) - current_token = self._stub_current_token + self.current_token_func = self._stub_current_token else: # other worker: stub out the update function (we're not interested in # any updates so when we get a POSITION we do nothing) update_function = self._stub_update_function - current_token = self._stub_current_token + self.current_token_func = self._stub_current_token - super().__init__(hs.get_instance_name(), current_token, update_function) + super().__init__(hs.get_instance_name(), update_function) + + def current_token(self, instance_name: str) -> Token: + return self.current_token_func(instance_name) + + def minimal_local_current_token(self) -> Token: + return self.current_token(self.local_instance_name) @staticmethod def _stub_current_token(instance_name: str) -> int: -- cgit 1.5.1