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When server leaves room check for stale device lists. #6801

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Jan 30, 2020

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@erikjohnston erikjohnston commented Jan 29, 2020

When a server leaves a room it may stop sharing a room with remote
users, and thus not get any updates to their device lists. So we need to
check for this case and mark those device lists and stale.

We don't need to do this if we stop sharing a room because the remote
user leaves the room, because we track that case via looking at
membership changes.


The alternative to marking the device lists as stale is to delete the users from the cache? This would mean that if the remote server is down we won't get stale events.

This, coupled with #6797, should help fix #6399.

When a server leaves a room it may stop sharing a room with remote
users, and thus not get any updates to their device lists. So we need to
check for this case and mark those device lists and stale.

We don't need to do this if we stop sharing a room because the remote
user leaves the room, because we track that case via looking at
membership changes.
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lgtm

synapse/storage/persist_events.py Outdated Show resolved Hide resolved
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lgtm x 2

@erikjohnston erikjohnston merged commit a5bab2d into develop Jan 30, 2020
@erikjohnston erikjohnston deleted the erikj/mark_left_rooms_as_stale branch February 5, 2020 17:34
babolivier added a commit that referenced this pull request Feb 12, 2020
Synapse 1.10.0 (2020-02-12)
===========================

**WARNING to client developers**: As of this release Synapse validates `client_secret` parameters in the Client-Server API as per the spec. See [\#6766](#6766) for details.

Updates to the Docker image
---------------------------

- Update the docker images to Alpine Linux 3.11. ([\#6897](#6897))

Synapse 1.10.0rc5 (2020-02-11)
==============================

Bugfixes
--------

- Fix the filtering introduced in 1.10.0rc3 to also apply to the state blocks returned by `/sync`. ([\#6884](#6884))

Synapse 1.10.0rc4 (2020-02-11)
==============================

This release candidate was built incorrectly and is superceded by 1.10.0rc5.

Synapse 1.10.0rc3 (2020-02-10)
==============================

Features
--------

- Filter out `m.room.aliases` from the CS API to mitigate abuse while a better solution is specced. ([\#6878](#6878))

Internal Changes
----------------

- Fix continuous integration failures with old versions of `pip`, which were introduced by a release of the `zipp` library. ([\#6880](#6880))

Synapse 1.10.0rc2 (2020-02-06)
==============================

Bugfixes
--------

- Fix an issue with cross-signing where device signatures were not sent to remote servers. ([\#6844](#6844))
- Fix to the unknown remote device detection which was introduced in 1.10.rc1. ([\#6848](#6848))

Internal Changes
----------------

- Detect unexpected sender keys on remote encrypted events and resync device lists. ([\#6850](#6850))

Synapse 1.10.0rc1 (2020-01-31)
==============================

Features
--------

- Add experimental support for updated authorization rules for aliases events, from [MSC2260](matrix-org/matrix-spec-proposals#2260). ([\#6787](#6787), [\#6790](#6790), [\#6794](#6794))

Bugfixes
--------

- Warn if postgres database has a non-C locale, as that can cause issues when upgrading locales (e.g. due to upgrading OS). ([\#6734](#6734))
- Minor fixes to `PUT /_synapse/admin/v2/users` admin api. ([\#6761](#6761))
- Validate `client_secret` parameter using the regex provided by the Client-Server API, temporarily allowing `:` characters for older clients. The `:` character will be removed in a future release. ([\#6767](#6767))
- Fix persisting redaction events that have been redacted (or otherwise don't have a redacts key). ([\#6771](#6771))
- Fix outbound federation request metrics. ([\#6795](#6795))
- Fix bug where querying a remote user's device keys that weren't cached resulted in only returning a single device. ([\#6796](#6796))
- Fix race in federation sender worker that delayed sending of device updates. ([\#6799](#6799), [\#6800](#6800))
- Fix bug where Synapse didn't invalidate cache of remote users' devices when Synapse left a room. ([\#6801](#6801))
- Fix waking up other workers when remote server is detected to have come back online. ([\#6811](#6811))

Improved Documentation
----------------------

- Clarify documentation related to `user_dir` and `federation_reader` workers. ([\#6775](#6775))

Internal Changes
----------------

- Record room versions in the `rooms` table. ([\#6729](#6729), [\#6788](#6788), [\#6810](#6810))
- Propagate cache invalidates from workers to other workers. ([\#6748](#6748))
- Remove some unnecessary admin handler abstraction methods. ([\#6751](#6751))
- Add some debugging for media storage providers. ([\#6757](#6757))
- Detect unknown remote devices and mark cache as stale. ([\#6776](#6776), [\#6819](#6819))
- Attempt to resync remote users' devices when detected as stale. ([\#6786](#6786))
- Delete current state from the database when server leaves a room. ([\#6792](#6792))
- When a client asks for a remote user's device keys check if the local cache for that user has been marked as potentially stale. ([\#6797](#6797))
- Add background update to clean out left rooms from current state. ([\#6802](#6802), [\#6816](#6816))
- Refactoring work in preparation for changing the event redaction algorithm. ([\#6803](#6803), [\#6805](#6805), [\#6806](#6806), [\#6807](#6807), [\#6820](#6820))
babolivier pushed a commit that referenced this pull request Sep 1, 2021
* commit 'a5bab2d05':
  When server leaves room check for stale device lists. (#6801)
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