Commit Graph

27 Commits (2ca4e349e9d0c606d802ae15c06089080fa4f27e)

Author SHA1 Message Date
Erik Johnston 6633a4015a
Allow moving account data and receipts streams off master (#9104) 2021-01-18 15:47:59 +00:00
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
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
Erik Johnston a7bdf98d01
Rename database classes to make some sense (#8033) 2020-08-05 21:38:57 +01:00
Richard van der Hoff 91f51c611c remove redundant `__func__`
this is a no-op under python 3
2020-05-15 19:37:41 +01:00
Erik Johnston d7983b63a6
Support any process writing to cache invalidation stream. (#7436) 2020-05-07 13:51:08 +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 4cff617df1
Move catchup of replication streams to worker. (#7024)
This changes the replication protocol so that the server does not send down `RDATA` for rows that happened before the client connected. Instead, the server will send a `POSITION` and clients then query the database (or master out of band) to get up to date.
2020-03-25 14:54:01 +00:00
Erik Johnston 5d7a6ad223
Allow streaming cache invalidate all to workers. (#6749) 2020-01-22 10:37:00 +00:00
Erik Johnston e8b68a4e4b
Fixup synapse.replication to pass mypy checks (#6667) 2020-01-14 14:08:06 +00:00
Erik Johnston 9a4fb457cf Change DataStores to accept 'database' param. 2019-12-06 13:30:06 +00:00
Erik Johnston a7f20500ff _CURRENT_STATE_CACHE_NAME is public 2019-12-04 15:45:42 +00:00
Erik Johnston 1056d6885a Move cache invalidation to main data store 2019-12-04 15:21:14 +00:00
Richard van der Hoff cc6243b4c0
document the REPLICATE command a bit better (#6305)
since I found myself wonder how it works
2019-11-04 12:40:18 +00:00
Amber Brown 32e7c9e7f2
Run Black. (#5482) 2019-06-20 19:32:02 +10:00
Erik Johnston 80467bbac3 Fix state cache invalidation on workers 2019-02-22 14:38:14 +00:00
Erik Johnston a9b5ea6fc1 Batch cache invalidation over replication
Currently whenever the current state changes in a room invalidate a lot
of caches, which cause *a lot* of traffic over replication. Instead,
lets batch up all those invalidations and send a single poke down
the replication streams.

Hopefully this will reduce load on the master process by substantially
reducing traffic.
2019-02-18 17:53:31 +00:00
Amber Brown 381d2cfdf0
Make workers work on Py3 (#4027) 2018-10-13 00:14:08 +11:00
Amber Brown 49af402019 run isort 2018-07-09 16:09:20 +10:00
Richard van der Hoff 6cfee09be9 Make __init__ consitstent across Store heirarchy
Add db_conn parameters to the `__init__` methods of the *Store classes, so that
they are all consistent, which makes the multiple inheritance work correctly
(and so that we can later extract mixins which can be used in the slavedstores)
2017-11-13 10:46:07 +00:00
Erik Johnston 3a1f3f8388 Change slave storage to use new replication interface
As the TCP replication uses a slightly different API and streams than
the HTTP replication.

This breaks HTTP replication.
2017-04-03 15:34:19 +01:00
Erik Johnston e933a2712d Don't log unknown cache warnings in workers 2017-02-28 16:22:41 +00:00
Erik Johnston 90565d015e Invalidate retry cache in both directions 2016-11-22 17:45:44 +00:00
Erik Johnston a2427981b7 Use cached get_user_by_access_token in slaves 2016-08-16 11:24:32 +01:00
Erik Johnston d9664344ec Rename table. Add docs. 2016-08-15 11:45:57 +01:00
Erik Johnston 64e7e11853 Implement cache replication stream 2016-08-15 11:16:45 +01:00
Mark Haines 75fb9ac1be Add a slaved events store class
Add a test to check that get_room_names_and_aliases does the same
thing on both the master and on the slave data store.
2016-04-06 14:18:35 +01:00