Whenever we want to persist an event, we first compute an event context,
which includes the state at the event and a flag indicating whether the
state is partial. After a lot of processing, we finally try to store the
event in the database, which can fail for partial state events when the
containing room has been un-partial stated in the meantime.
We detect the race as a foreign key constraint failure in the data store
layer and turn it into a special `PartialStateConflictError` exception,
which makes its way up to the method in which we computed the event
context.
To make things difficult, the exception needs to cross a replication
request: `/fed_send_events` for events coming over federation and
`/send_event` for events from clients. We transport the
`PartialStateConflictError` as a `409 Conflict` over replication and
turn `409`s back into `PartialStateConflictError`s on the worker making
the request.
All client events go through
`EventCreationHandler.handle_new_client_event`, which is called in
*a lot* of places. Instead of trying to update all the code which
creates client events, we turn the `PartialStateConflictError` into a
`429 Too Many Requests` in
`EventCreationHandler.handle_new_client_event` and hope that clients
take it as a hint to retry their request.
On the federation event side, there are 7 places which compute event
contexts. 4 of them use outlier event contexts:
`FederationEventHandler._auth_and_persist_outliers_inner`,
`FederationHandler.do_knock`, `FederationHandler.on_invite_request` and
`FederationHandler.do_remotely_reject_invite`. These events won't have
the partial state flag, so we do not need to do anything for then.
The remaining 3 paths which create events are
`FederationEventHandler.process_remote_join`,
`FederationEventHandler.on_send_membership_event` and
`FederationEventHandler._process_received_pdu`.
We can't experience the race in `process_remote_join`, unless we're
handling an additional join into a partial state room, which currently
blocks, so we make no attempt to handle it correctly.
`on_send_membership_event` is only called by
`FederationServer._on_send_membership_event`, so we catch the
`PartialStateConflictError` there and retry just once.
`_process_received_pdu` is called by `on_receive_pdu` for incoming
events and `_process_pulled_event` for backfill. The latter should never
try to persist partial state events, so we ignore it. We catch the
`PartialStateConflictError` in `on_receive_pdu` and retry just once.
Refering to the graph of code paths in
https://github.com/matrix-org/synapse/issues/12988#issuecomment-1156857648
may make the above make more sense.
Signed-off-by: Sean Quah <seanq@matrix.org>
* Cast to postgres types when handling postgres db
* Remove unused method
* Easy annotations
* Annotate create_room
* Use `ParamSpec` to annotate looping_call
* Annotate `default_config`
* Track `now` as a float
`time_ms` returns an int like the proper Synapse `Clock`
* Introduce a `Timer` dataclass
* Introduce a Looper type
* Suppress checking of a mock
* tests.utils is typed
* Changelog
* Whoops, import ParamSpec from typing_extensions
* ditch the psycopg2 casts
==============================
Bugfixes
--------
- Update the version of the [ldap3 plugin](https://github.com/matrix-org/matrix-synapse-ldap3/) included in the `matrixdotorg/synapse` DockerHub images and the Debian packages hosted on `packages.matrix.org` to 0.2.1. This fixes [a bug](https://github.com/matrix-org/matrix-synapse-ldap3/pull/163) with usernames containing uppercase characters. ([\#13156](https://github.com/matrix-org/synapse/issues/13156))
- Fix a bug introduced in Synapse 1.62.0rc1 affecting unread counts for users on small servers. ([\#13168](https://github.com/matrix-org/synapse/issues/13168))
-----BEGIN PGP SIGNATURE-----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=SpI6
-----END PGP SIGNATURE-----
Merge tag 'v1.62.0rc3' into develop
Synapse 1.62.0rc3 (2022-07-04)
==============================
Bugfixes
--------
- Update the version of the [ldap3 plugin](https://github.com/matrix-org/matrix-synapse-ldap3/) included in the `matrixdotorg/synapse` DockerHub images and the Debian packages hosted on `packages.matrix.org` to 0.2.1. This fixes [a bug](https://github.com/matrix-org/matrix-synapse-ldap3/pull/163) with usernames containing uppercase characters. ([\#13156](https://github.com/matrix-org/synapse/issues/13156))
- Fix a bug introduced in Synapse 1.62.0rc1 affecting unread counts for users on small servers. ([\#13168](https://github.com/matrix-org/synapse/issues/13168))
==============================
Bugfixes
--------
- Fix unread counts for users on large servers. Introduced in v1.62.0rc1. ([\#13140](https://github.com/matrix-org/synapse/issues/13140))
- Fix DB performance when deleting old push notifications. Introduced in v1.62.0rc1. ([\#13141](https://github.com/matrix-org/synapse/issues/13141))
-----BEGIN PGP SIGNATURE-----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=PH+y
-----END PGP SIGNATURE-----
Merge tag 'v1.62.0rc2' into develop
Synapse 1.62.0rc2 (2022-07-01)
==============================
Bugfixes
--------
- Fix unread counts for users on large servers. Introduced in v1.62.0rc1. ([\#13140](https://github.com/matrix-org/synapse/issues/13140))
- Fix DB performance when deleting old push notifications. Introduced in v1.62.0rc1. ([\#13141](https://github.com/matrix-org/synapse/issues/13141))
When we receive an event over federation during a faster join, there is no need
to wait for full state, since we have a whole reconciliation process designed
to take the partial state into account.
