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Add ability to wait for replication streams (#7542)

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The idea here is that if an instance persists an event via the replication HTTP API it can return before we receive that event over replication, which can lead to races where code assumes that persisting an event immediately updates various caches (e.g. current state of the room).

Most of Synapse doesn't hit such races, so we don't do the waiting automagically, instead we do so where necessary to avoid unnecessary delays. We may decide to change our minds here if it turns out there are a lot of subtle races going on.

People probably want to look at this commit by commit.
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Erik Johnston 2020-05-22 14:21:54 +01:00 • committed by GitHub
parent 06a02bc1ce
commit 1531b214fc
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24 changed files with 304 additions and 112 deletions
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5
synapse/server.py
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@ -90,6 +90,7 @@ from synapse.push.pusherpool import PusherPool
from synapse.replication.tcp.client import ReplicationDataHandler
from synapse.replication.tcp.handler import ReplicationCommandHandler
from synapse.replication.tcp.resource import ReplicationStreamer
from synapse.replication.tcp.streams import STREAMS_MAP
from synapse.rest.media.v1.media_repository import (
MediaRepository,
MediaRepositoryResource,
@ -210,6 +211,7 @@ class HomeServer(object):
"storage",
"replication_streamer",
"replication_data_handler",
"replication_streams",
]
REQUIRED_ON_MASTER_STARTUP = ["user_directory_handler", "stats_handler"]
@ -583,6 +585,9 @@ class HomeServer(object):
def build_replication_data_handler(self):
return ReplicationDataHandler(self)
def build_replication_streams(self):
return {stream.NAME: stream(self) for stream in STREAMS_MAP.values()}
def remove_pusher(self, app_id, push_key, user_id):
return self.get_pusherpool().remove_pusher(app_id, push_key, user_id)