Commit Graph

34 Commits

Author SHA1 Message Date
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
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
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
Richard van der Hoff
931b026844
Remove an unused prometheus metric (#7878) 2020-07-22 00:40:55 +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
Will Hunt
62b1ce8539
isort 5 compatibility (#7786)
The CI appears to use the latest version of isort, which is a problem when isort gets a major version bump. Rather than try to pin the version, I've done the necessary to make isort5 happy with synapse.
2020-07-05 16:32:02 +01:00
Patrick Cloke
7d2532be36
Discard RDATA from already seen positions. (#7648) 2020-06-15 08:44:54 -04:00
Erik Johnston
9bac5d62b3
Ensure ReplicationStreamer is always started when replication enabled. (#7579)
Fixes #7566.
2020-05-27 11:44:19 +01:00
Erik Johnston
e5c67d04db
Add option to move event persistence off master (#7517) 2020-05-22 16:11:35 +01:00
Erik Johnston
7ee24c5674
Have all instances correctly respond to REPLICATE command. (#7475)
Before all streams were only written to from master, so only master needed to respond to `REPLICATE` commands.

Before all instances wrote to the cache invalidation stream, but didn't respond to `REPLICATE`. This was a bug, which could lead to missed rows from cache invalidation stream if an instance is restarted, however all the caches would be empty in that case so it wasn't a problem.
2020-05-13 10:27:02 +01:00
Erik Johnston
8ca79613e6
Fix Redis reconnection logic (#7482)
Proactively send out `POSITION` commands (as if we had just received a `REPLICATE`) when we connect to Redis. This is important as other instances won't notice we've connected to issue a `REPLICATE` command (unlike for direct TCP connections). This is only currently an issue if master process reconnects without restarting (if it restarts then it won't have written anything and so other instances probably won't have missed anything).
2020-05-13 09:57:15 +01:00
Andrew Morgan
5cf758cdd6 Merge branch 'release-v1.13.0' into develop
* release-v1.13.0:
  Don't UPGRADE database rows
  RST indenting
  Put rollback instructions in upgrade notes
  Fix changelog typo
  Oh yeah, RST
  Absolute URL it is then
  Fix upgrade notes link
  Provide summary of upgrade issues in changelog. Fix )
  Move next version notes from changelog to upgrade notes
  Changelog fixes
  1.13.0rc1
  Documentation on setting up redis (#7446)
  Rework UI Auth session validation for registration (#7455)
  Fix errors from malformed log line (#7454)
  Drop support for redis.dbid (#7450)
2020-05-11 16:46:33 +01:00
Richard van der Hoff
da9b2db3af
Drop support for redis.dbid (#7450)
Since we only use pubsub, the dbid is irrelevant.
2020-05-07 16:46:15 +01:00
Erik Johnston
d7983b63a6
Support any process writing to cache invalidation stream. (#7436) 2020-05-07 13:51:08 +01:00
Richard van der Hoff
a8c17da245 Merge branch 'release-v1.13.0' into rav/fix_dropped_messages 2020-05-05 23:01:12 +01:00
Richard van der Hoff
1242267316 Merge branch 'release-v1.13.0' into rav/fix_dropped_messages 2020-05-05 22:38:44 +01:00
Richard van der Hoff
7f7eedbebb Wait for a POSITION on the right connection before accepting RDATA
... otherwise we can believe we're up to date when we're not.
2020-05-05 22:38:16 +01:00
Brendan Abolivier
5b8023dc7f
Move logs about discarded RDATA to debug (#7421) 2020-05-05 21:07:33 +02:00
Richard van der Hoff
d78265af0c Wait to subscribe before sending REPLICATE 2020-05-05 19:31:37 +01:00
Erik Johnston
0e719f2398
Thread through instance name to replication client. (#7369)
For in memory streams when fetching updates on workers we need to query the source of the stream, which currently is hard coded to be master. This PR threads through the source instance we received via `POSITION` through to the update function in each stream, which can then be passed to the replication client for in memory streams.
2020-05-01 17:19:56 +01:00
Erik Johnston
3085cde577
Use stream.current_token() and remove stream_positions() (#7172)
We move the processing of typing and federation replication traffic into their handlers so that `Stream.current_token()` points to a valid token. This allows us to remove `get_streams_to_replicate()` and `stream_positions()`.
2020-05-01 15:21:35 +01:00
Erik Johnston
37f6823f5b
Add instance name to RDATA/POSITION commands (#7364)
This is primarily for allowing us to send those commands from workers, but for now simply allows us to ignore echoed RDATA/POSITION commands that we sent (we get echoes of sent commands when using redis). Currently we log a WARNING on the master process every time we receive an echoed RDATA.
2020-04-29 16:23:08 +01:00
Erik Johnston
3eab76ad43
Don't relay REMOTE_SERVER_UP cmds to same conn. (#7352)
For direct TCP connections we need the master to relay REMOTE_SERVER_UP
commands to the other connections so that all instances get notified
about it. The old implementation just relayed to all connections,
assuming that sending back to the original sender of the command was
safe. This is not true for redis, where commands sent get echoed back to
the sender, which was causing master to effectively infinite loop
sending and then re-receiving REMOTE_SERVER_UP commands that it sent.

The fix is to ensure that we only relay to *other* connections and not
to the connection we received the notification from.

Fixes #7334.
2020-04-29 14:10:59 +01:00
Richard van der Hoff
c2e1a2110f
Fix limit logic for EventsStream (#7358)
* Factor out functions for injecting events into database

I want to add some more flexibility to the tools for injecting events into the
database, and I don't want to clutter up HomeserverTestCase with them, so let's
factor them out to a new file.

* Rework TestReplicationDataHandler

This wasn't very easy to work with: the mock wrapping was largely superfluous,
and it's useful to be able to inspect the received rows, and clear out the
received list.

* Fix AssertionErrors being thrown by EventsStream

Part of the problem was that there was an off-by-one error in the assertion,
but also the limit logic was too simple. Fix it all up and add some tests.
2020-04-29 12:30:36 +01:00
Richard van der Hoff
71a1abb8a1
Stop the master relaying USER_SYNC for other workers (#7318)
Long story short: if we're handling presence on the current worker, we shouldn't be sending USER_SYNC commands over replication.

In an attempt to figure out what is going on here, I ended up refactoring some bits of the presencehandler code, so the first 4 commits here are non-functional refactors to move this code slightly closer to sanity. (There's still plenty to do here :/). Suggest reviewing individual commits.

Fixes (I hope) #7257.
2020-04-22 22:39:04 +01:00
Erik Johnston
51f7eaf908
Add ability to run replication protocol over redis. (#7040)
This is configured via the `redis` config options.
2020-04-22 13:07:41 +01:00
Richard van der Hoff
0f8f02bc39
On catchup, process each row with its own stream id (#7286)
Other parts of the code (such as the StreamChangeCache) assume that there will
not be multiple changes with the same stream id.

This code was introduced in #7024, and I hope this fixes #7206.
2020-04-20 11:43:29 +01:00
Richard van der Hoff
6a519a0ca0 Remove vestigal references to SYNC replication command
We've ripped pretty much all of this out: let's remove the remains.
2020-04-07 17:40:07 +01:00
Erik Johnston
ce72355d7f
Fix race in replication (#7226)
Fixes a race between handling `POSITION` and `RDATA` commands. We do this by simply linearizing handling of them.
2020-04-07 11:01:04 +01:00
Erik Johnston
82498ee901
Move server command handling out of TCP protocol (#7187)
This completes the merging of server and client command processing.
2020-04-07 10:51:07 +01:00
Erik Johnston
5016b162fc
Move client command handling out of TCP protocol (#7185)
The aim here is to move the command handling out of the TCP protocol classes and to also merge the client and server command handling (so that we can reuse them for redis protocol). This PR simply moves the client paths to the new `ReplicationCommandHandler`, a future PR will move the server paths too.
2020-04-06 09:58:42 +01:00