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Add experimental support for sharding event persister. (#8170)

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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.
This commit is contained in:
Erik Johnston 2020-09-02 15:48:37 +01:00 • committed by GitHub
parent b257c788c0
commit 82c1ee1c22
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18 changed files with 206 additions and 77 deletions
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14
synapse/handlers/room.py
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@ -804,7 +804,9 @@ class RoomCreationHandler(BaseHandler):
# Always wait for room creation to progate before returning
await self._replication.wait_for_stream_position(
self.hs.config.worker.writers.events, "events", last_stream_id
self.hs.config.worker.events_shard_config.get_instance(room_id),
"events",
last_stream_id,
)
return result, last_stream_id
@ -1260,10 +1262,10 @@ class RoomShutdownHandler(object):
# We now wait for the create room to come back in via replication so
# that we can assume that all the joins/invites have propogated before
# we try and auto join below.
#
# TODO: Currently the events stream is written to from master
await self._replication.wait_for_stream_position(
self.hs.config.worker.writers.events, "events", stream_id
self.hs.config.worker.events_shard_config.get_instance(new_room_id),
"events",
stream_id,
)
else:
new_room_id = None
@ -1293,7 +1295,9 @@ class RoomShutdownHandler(object):
# Wait for leave to come in over replication before trying to forget.
await self._replication.wait_for_stream_position(
self.hs.config.worker.writers.events, "events", stream_id
self.hs.config.worker.events_shard_config.get_instance(room_id),
"events",
stream_id,
)
await self.room_member_handler.forget(target_requester.user, room_id)