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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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synapse/rest/client/v2_alpha/relations.py
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@ -111,7 +111,7 @@ class RelationSendServlet(RestServlet):
"sender": requester.user.to_string(),
}
event = await self.event_creation_handler.create_and_send_nonmember_event(
event, _ = await self.event_creation_handler.create_and_send_nonmember_event(
requester, event_dict=event_dict, txn_id=txn_id
)