Commit Graph

493 Commits

Author SHA1 Message Date
Erik Johnston
8de3703d21
Make event persisters periodically announce position over replication. (#8499)
Currently background proccesses stream the events stream use the "minimum persisted position" (i.e. `get_current_token()`) rather than the vector clock style tokens. This is broadly fine as it doesn't matter if the background processes lag a small amount. However, in extreme cases (i.e. SyTests) where we only write to one event persister the background processes will never make progress.

This PR changes it so that the `MultiWriterIDGenerator` keeps the current position of a given instance as up to date as possible (i.e using the latest token it sees if its not in the process of persisting anything), and then periodically announces that over replication. This then allows the "minimum persisted position" to advance, albeit with a small lag.
2020-10-12 15:51:41 +01:00
Patrick Cloke
1781bbe319
Add type hints to response cache. (#8507) 2020-10-09 11:35:11 -04:00
Erik Johnston
5009ffcaa4
Only send RDATA for instance local events. (#8496)
When pulling events out of the DB to send over replication we were not
filtering by instance name, and so we were sending events for other
instances.
2020-10-09 13:10:33 +01:00
Patrick Cloke
c9c0ad5e20
Remove the deprecated Handlers object (#8494)
All handlers now available via get_*_handler() methods on the HomeServer.
2020-10-09 07:24:34 -04:00
Erik Johnston
6c5d5e507e
Add unit test for event persister sharding (#8433) 2020-10-02 09:57:12 +01:00
Patrick Cloke
4ff0201e62
Enable mypy checking for unreachable code and fix instances. (#8432) 2020-10-01 08:09:18 -04:00
Erik Johnston
ea70f1c362
Various clean ups to room stream tokens. (#8423) 2020-09-29 21:48:33 +01:00
Richard van der Hoff
866c84da8d
Add metrics to track success/otherwise of replication requests (#8406)
One hope is that this might provide some insights into #3365.
2020-09-29 11:06:11 +01:00
Erik Johnston
f112cfe5bb
Fix MultiWriteIdGenerator's handling of restarts. (#8374)
On startup `MultiWriteIdGenerator` fetches the maximum stream ID for
each instance from the table and uses that as its initial "current
position" for each writer. This is problematic as a) it involves either
a scan of events table or an index (neither of which is ideal), and b)
if rows are being persisted out of order elsewhere while the process
restarts then using the maximum stream ID is not correct. This could
theoretically lead to race conditions where e.g. events that are
persisted out of order are not sent down sync streams.

We fix this by creating a new table that tracks the current positions of
each writer to the stream, and update it each time we finish persisting
a new entry. This is a relatively small overhead when persisting events.
However for the cache invalidation stream this is a much bigger relative
overhead, so instead we note that for invalidation we don't actually
care about reliability over restarts (as there's no caches to
invalidate) and simply don't bother reading and writing to the new table
in that particular case.
2020-09-24 16:53:51 +01:00
Erik Johnston
ac11fcbbb8
Add EventStreamPosition type (#8388)
The idea is to remove some of the places we pass around `int`, where it can represent one of two things:

1. the position of an event in the stream; or
2. a token that partitions the stream, used as part of the stream tokens.

The valid operations are then:

1. did a position happen before or after a token;
2. get all events that happened before or after a token; and
3. get all events between two tokens.

(Note that we don't want to allow other operations as we want to change the tokens to be vector clocks rather than simple ints)
2020-09-24 13:24:17 +01:00
Patrick Cloke
8a4a4186de
Simplify super() calls to Python 3 syntax. (#8344)
This converts calls like super(Foo, self) -> super().

Generated with:

    sed -i "" -Ee 's/super\([^\(]+\)/super()/g' **/*.py
2020-09-18 09:56:44 -04:00
Jonathan de Jong
a3f124b821
Switch metaclass initialization to python 3-compatible syntax (#8326) 2020-09-16 15:15:55 -04:00
Patrick Cloke
aec294ee0d
Use slots in attrs classes where possible (#8296)
slots use less memory (and attribute access is faster) while slightly
limiting the flexibility of the class attributes. This focuses on objects
which are instantiated "often" and for short periods of time.
2020-09-14 12:50:06 -04:00
Patrick Cloke
d2a3eb04a4 Fix typos in comments. 2020-09-14 11:46:58 -04:00
Erik Johnston
04cc249b43
Add experimental support for sharding event persister. Again. (#8294)
This is *not* ready for production yet. Caveats:

1. We should write some tests...
2. The stream token that we use for events can get stalled at the minimum position of all writers. This means that new events may not be processed and e.g. sent down sync streams if a writer isn't writing or is slow.
2020-09-14 10:16:41 +01:00
Erik Johnston
5d3e306d9f
Clean up Notifier.on_new_room_event code path (#8288)
The idea here is that we pass the `max_stream_id` to everything, and only use the stream ID of the particular event to figure out *when* the max stream position has caught up to the event and we can notify people about it.

This is to maintain the distinction between the position of an item in the stream (i.e. event A has stream ID 513) and a token that can be used to partition the stream (i.e. give me all events after stream ID 352). This distinction becomes important when the tokens are more complicated than a single number, which they will be once we start tracking the position of multiple writers in the tokens.

The valid operations here are:

1. Is a position before or after a token
2. Fetching all events between two tokens
3. Merging multiple tokens to get the "max", i.e. `C = max(A, B)` means that for all positions P where P is before A *or* before B, then P is before C.

Future PR will change the token type to a dedicated type.
2020-09-10 13:24:43 +01:00
Patrick Cloke
2ea1c68249
Remove some unused distributor signals (#8216)
Removes the `user_joined_room` and stops calling it since there are no observers.

Also cleans-up some other unused signals and related code.
2020-09-09 12:22:00 -04:00
Erik Johnston
c9dbee50ae
Fixup pusher pool notifications (#8287)
`pusher_pool.on_new_notifications` expected a min and max stream ID, however that was not what we were passing in. Instead, let's just pass it the current max stream ID and have it track the last stream ID it got passed.

I believe that it mostly worked as we called the function for every event. However, it would break for events that got persisted out of order, i.e, that were persisted but the max stream ID wasn't incremented as not all preceding events had finished persisting, and push for that event would be delayed until another event got pushed to the effected users.
2020-09-09 16:56:08 +01:00
Erik Johnston
dc9dcdbd59 Revert "Fixup pusher pool notifications"
This reverts commit e7fd336a53.
2020-09-09 16:19:22 +01:00
Erik Johnston
e7fd336a53 Fixup pusher pool notifications 2020-09-09 16:17:50 +01:00
Patrick Cloke
c619253db8
Stop sub-classing object (#8249) 2020-09-04 06:54:56 -04:00
Brendan Abolivier
9f8abdcc38
Revert "Add experimental support for sharding event persister. (#8170)" (#8242)
* Revert "Add experimental support for sharding event persister. (#8170)"

This reverts commit 82c1ee1c22.

* Changelog
2020-09-04 10:19:42 +01:00
Erik Johnston
82c1ee1c22
Add experimental support for sharding event persister. (#8170)
This is *not* ready for production yet. Caveats:

1. We should write some tests...
2. The stream token that we use for events can get stalled at the minimum position of all writers. This means that new events may not be processed and e.g. sent down sync streams if a writer isn't writing or is slow.
2020-09-02 15:48:37 +01:00
Richard van der Hoff
aa07c37cf0
Move and rename get_devices_with_keys_by_user (#8204)
* Move `get_devices_with_keys_by_user` to `EndToEndKeyWorkerStore`

this seems a better fit for it.

This commit simply moves the existing code: no other changes at all.

* Rename `get_devices_with_keys_by_user`

to better reflect what it does.

* get_device_stream_token abstract method

To avoid referencing fields which are declared in the derived classes, make
`get_device_stream_token` abstract, and define that in the classes which define
`_device_list_id_gen`.
2020-09-01 12:41:21 +01:00
Erik Johnston
3b4556cf87
Fix wait_for_stream_position for multiple waiters. (#8196)
This fixes a bug where having multiple callers waiting on the same
stream and position will cause it to try and compare two deferreds,
which fails (due to the sorted list having an entry of `Tuple[int,
Deferred]`).
2020-08-28 17:12:45 +01:00
Erik Johnston
e3c91a3c55
Make SlavedIdTracker.advance have same interface as MultiWriterIDGenerator (#8171) 2020-08-26 13:15:20 +01:00
Erik Johnston
c9c544cda5
Remove ChainedIdGenerator. (#8123)
It's just a thin wrapper around two ID gens to make `get_current_token`
and `get_next` return tuples. This can easily be replaced by calling the
appropriate methods on the underlying ID gens directly.
2020-08-19 13:41:51 +01:00
Patrick Cloke
eebf52be06
Be stricter about JSON that is accepted by Synapse (#8106) 2020-08-19 07:26:03 -04:00
Erik Johnston
76d21d14a0
Separate get_current_token into two. (#8113)
The function is used for two purposes: 1) for subscribers of streams to
get a token they can use to get further updates with, and 2) for
replication to track position of the writers of the stream.

For streams with a single writer the two scenarios produce the same
result, however the situation becomes complicated for streams with
multiple writers. The current `MultiWriterIdGenerator` does not
correctly handle the first case (which is not an issue as its only used
for the `caches` stream which nothing subscribes to outside of
replication).
2020-08-19 10:39:31 +01:00
Patrick Cloke
ac77cdb64e
Add a shadow-banned flag to users. (#8092) 2020-08-14 12:37:59 -04:00
David Vo
4dd27e6d11
Reduce unnecessary whitespace in JSON. (#7372) 2020-08-07 08:02:55 -04:00
Patrick Cloke
d4a7829b12
Convert synapse.api to async/await (#8031) 2020-08-06 08:30:06 -04:00
Erik Johnston
a7bdf98d01
Rename database classes to make some sense (#8033) 2020-08-05 21:38:57 +01:00
Patrick Cloke
3b415e23a5
Convert replication code to async/await. (#7987) 2020-08-03 07:12:55 -04:00
Richard van der Hoff
349119a340 Synapse 1.18.0rc2 (2020-07-28)
==============================
 
 Bugfixes
 --------
 
 - Fix an `AssertionError` exception introduced in v1.18.0rc1. ([\#7876](https://github.com/matrix-org/synapse/issues/7876))
 - Fix experimental support for moving typing off master when worker is restarted, which is broken in v1.18.0rc1. ([\#7967](https://github.com/matrix-org/synapse/issues/7967))
 
 Internal Changes
 ----------------
 
 - Further optimise queueing of inbound replication commands. ([\#7876](https://github.com/matrix-org/synapse/issues/7876))
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Merge tag 'v1.18.0rc2' into develop

Synapse 1.18.0rc2 (2020-07-28)
==============================

Bugfixes
--------

- Fix an `AssertionError` exception introduced in v1.18.0rc1. ([\#7876](https://github.com/matrix-org/synapse/issues/7876))
- Fix experimental support for moving typing off master when worker is restarted, which is broken in v1.18.0rc1. ([\#7967](https://github.com/matrix-org/synapse/issues/7967))

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

- Further optimise queueing of inbound replication commands. ([\#7876](https://github.com/matrix-org/synapse/issues/7876))
2020-07-28 11:31:31 +01:00
Erik Johnston
a8f7ed28c6
Typing worker needs to handle stream update requests (#7967)
IIRC this doesn't break tests because its only hit on reconnection, or something.

Basically, when a process needs to fetch missing updates for the `typing` stream it needs to query the writer instance via HTTP (as we don't write typing notifications to the DB), the problem was that the endpoint (`streams`) was only registered on master and specifically not on the typing writer worker.
2020-07-28 11:04:53 +01:00
Richard van der Hoff
f57b99af22
Handle replication commands synchronously where possible (#7876)
Most of the stuff we do for replication commands can be done synchronously. There's no point spinning up background processes if we're not going to need them.
2020-07-27 18:54:43 +01:00
Patrick Cloke
8553f46498
Convert a synapse.events to async/await. (#7949) 2020-07-27 13:40:22 -04:00
Erik Johnston
84d099ae11
Fix typing replication not being handled on master (#7959)
Handling of incoming typing stream updates from replication was not
hooked up on master, effecting set ups where typing was handled on a
different worker.

This is really only a problem if the master process is also handling
sync requests, which is unlikely for those that are at the stage of
moving typing off.

The other observable effect is that if a worker restarts or a
replication connect drops then the typing worker will issue a
`POSITION typing`, triggering master process to try and stream *all*
typing updates from position 0.

Fixes #7907
2020-07-27 14:10:53 +01:00
Richard van der Hoff
931b026844
Remove an unused prometheus metric (#7878) 2020-07-22 00:40:55 +01:00
Richard van der Hoff
05060e0223
Track command processing as a background process (#7879)
I'm going to be doing more stuff synchronously, and I don't want to lose the
CPU metrics down the sofa.
2020-07-22 00:40:42 +01:00
Karthikeyan Singaravelan
a7b06a81f0
Fix deprecation warning: import ABC from collections.abc (#7892) 2020-07-20 13:33:04 -04:00
Erik Johnston
2d2acc1cf2
Stop using 'device_max_stream_id' (#7882)
It serves no purpose and updating everytime we write to the device inbox
stream means all such transactions will conflict, causing lots of
transaction failures and retries.
2020-07-17 17:03:27 +01:00
Richard van der Hoff
e5300063ed
Optimise queueing of inbound replication commands (#7861)
When we get behind on replication, we tend to stack up background processes
behind a linearizer. Bg processes are heavy (particularly with respect to
prometheus metrics) and linearizers aren't terribly efficient once the queue
gets long either.

A better approach is to maintain a queue of requests to be processed, and
nominate a single process to work its way through the queue.

Fixes: #7444
2020-07-16 15:49:37 +01:00
Erik Johnston
f2e38ca867
Allow moving typing off master (#7869) 2020-07-16 15:12:54 +01:00
Erik Johnston
f299441cc6
Add ability to shard the federation sender (#7798) 2020-07-10 18:26:36 +01:00
Patrick Cloke
38e1fac886
Fix some spelling mistakes / typos. (#7811) 2020-07-09 09:52:58 -04:00
Richard van der Hoff
2ab0b021f1
Generate real events when we reject invites (#7804)
Fixes #2181. 

The basic premise is that, when we
fail to reject an invite via the remote server, we can generate our own
out-of-band leave event and persist it as an outlier, so that we have something
to send to the client.
2020-07-09 10:40:19 +01:00
Patrick Cloke
e7efd8f827
Do not use simplejson in Synapse. (#7800) 2020-07-08 07:15:08 -04:00
Erik Johnston
67d7756fcf
Refactor getting replication updates from database v2. (#7740) 2020-07-07 12:11:35 +01:00