Commit Graph

5 Commits

Author SHA1 Message Date
Eric Eastwood
11db575218
Sliding Sync: Use stream_ordering based timeline pagination for incremental sync (#17510)
Use `stream_ordering` based `timeline` pagination for incremental
`/sync` in Sliding Sync. Previously, we were always using a
`topological_ordering` but we should only be using that for historical
scenarios (initial `/sync`, newly joined, or haven't sent the room down
the connection before).

This is slightly different than what the [spec
suggests](https://spec.matrix.org/v1.10/client-server-api/#syncing)

> Events are ordered in this API according to the arrival time of the
event on the homeserver. This can conflict with other APIs which order
events based on their partial ordering in the event graph. This can
result in duplicate events being received (once per distinct API
called). Clients SHOULD de-duplicate events based on the event ID when
this happens.

But we've had a [discussion below in this
PR](https://github.com/element-hq/synapse/pull/17510#discussion_r1699105569)
and this matches what Sync v2 already does and seems like it makes
sense. Created a spec issue
https://github.com/matrix-org/matrix-spec/issues/1917 to clarify this.

Related issues:

 - https://github.com/matrix-org/matrix-spec/issues/1917
 - https://github.com/matrix-org/matrix-spec/issues/852
 - https://github.com/matrix-org/matrix-spec-proposals/pull/4033
2024-08-07 11:27:50 -05:00
Eric Eastwood
350062661c
Clarify that we mark as outliers because we don't have any state for them (#12345)
As discussed at https://github.com/matrix-org/synapse/pull/12179#discussion_r837263852
2022-04-06 16:34:33 -05:00
Richard van der Hoff
52a947dc46
Updates to the Room DAG concepts development document (#12179)
Some stuff that came up while we were talking about #12173.
2022-03-10 15:18:31 +00:00
Eric Eastwood
4eb77965cd
Update backward extremity docs to make it clear that it does not indicate whether we have fetched an events' prev_events (#11469)
Spawning from https://github.com/matrix-org/synapse/pull/9445#discussion_r758958181

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
2021-12-03 18:25:04 -06:00
Eric Eastwood
2bae2c632f
Add developer documentation to explain room DAG concepts like outliers and state_groups (#10464) 2021-08-03 10:08:57 +00:00