diff options
Diffstat (limited to 'synapse/replication/tcp/handler.py')
| -rw-r--r-- | synapse/replication/tcp/handler.py | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/synapse/replication/tcp/handler.py b/synapse/replication/tcp/handler.py index cbcf46f3ae..e6a2e2598b 100644 --- a/synapse/replication/tcp/handler.py +++ b/synapse/replication/tcp/handler.py @@ -112,8 +112,8 @@ class ReplicationCommandHandler: "replication_position", clock=self._clock ) - # Map of stream to batched updates. See RdataCommand for info on how - # batching works. + # Map of stream name to batched updates. See RdataCommand for info on + # how batching works. self._pending_batches = {} # type: Dict[str, List[Any]] # The factory used to create connections. @@ -123,7 +123,8 @@ class ReplicationCommandHandler: # outgoing replication commands to.) self._connections = [] # type: List[AbstractConnection] - # For each connection, the incoming streams that are coming from that connection + # For each connection, the incoming stream names that are coming from + # that connection. self._streams_by_connection = {} # type: Dict[AbstractConnection, Set[str]] LaterGauge( @@ -310,7 +311,28 @@ class ReplicationCommandHandler: # Check if this is the last of a batch of updates rows = self._pending_batches.pop(stream_name, []) rows.append(row) - await self.on_rdata(stream_name, cmd.instance_name, cmd.token, rows) + + stream = self._streams.get(stream_name) + if not stream: + logger.error("Got RDATA for unknown stream: %s", stream_name) + return + + # Find where we previously streamed up to. + current_token = stream.current_token(cmd.instance_name) + + # Discard this data if this token is earlier than the current + # position. Note that streams can be reset (in which case you + # expect an earlier token), but that must be preceded by a + # POSITION command. + if cmd.token <= current_token: + logger.debug( + "Discarding RDATA from stream %s at position %s before previous position %s", + stream_name, + cmd.token, + current_token, + ) + else: + await self.on_rdata(stream_name, cmd.instance_name, cmd.token, rows) async def on_rdata( self, stream_name: str, instance_name: str, token: int, rows: list |