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Document that most streams can only have a single writer. (#12196)

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This includes the `typing`, `to_device`, `account_data`, `receipts`, and `presence`
streams (really anything except the `events` stream).
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changelog.d/12196.doc Normal file
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Document that the `typing`, `to_device`, `account_data`, `receipts`, and `presence` stream writer can only be used on a single worker.

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docs/workers.md
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@ -351,8 +351,11 @@ is only supported with Redis-based replication.)
To enable this, the worker must have a HTTP replication listener configured,
have a `worker_name` and be listed in the `instance_map` config. The same worker
can handle multiple streams. For example, to move event persistence off to a
dedicated worker, the shared configuration would include:
can handle multiple streams, but unless otherwise documented, each stream can only
have a single writer.
For example, to move event persistence off to a dedicated worker, the shared
configuration would include:
```yaml
instance_map:
@ -370,8 +373,8 @@ streams and the endpoints associated with them:
##### The `events` stream
The `events` stream also experimentally supports having multiple writers, where
work is sharded between them by room ID. Note that you *must* restart all worker
The `events` stream experimentally supports having multiple writers, where work
is sharded between them by room ID. Note that you *must* restart all worker
instances when adding or removing event persisters. An example `stream_writers`
configuration with multiple writers:
@ -384,38 +387,38 @@ stream_writers:
##### The `typing` stream
The following endpoints should be routed directly to the workers configured as
stream writers for the `typing` stream:
The following endpoints should be routed directly to the worker configured as
the stream writer for the `typing` stream:
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/typing
##### The `to_device` stream
The following endpoints should be routed directly to the workers configured as
stream writers for the `to_device` stream:
The following endpoints should be routed directly to the worker configured as
the stream writer for the `to_device` stream:
^/_matrix/client/(api/v1|r0|v3|unstable)/sendToDevice/
##### The `account_data` stream
The following endpoints should be routed directly to the workers configured as
stream writers for the `account_data` stream:
The following endpoints should be routed directly to the worker configured as
the stream writer for the `account_data` stream:
^/_matrix/client/(api/v1|r0|v3|unstable)/.*/tags
^/_matrix/client/(api/v1|r0|v3|unstable)/.*/account_data
##### The `receipts` stream
The following endpoints should be routed directly to the workers configured as
stream writers for the `receipts` stream:
The following endpoints should be routed directly to the worker configured as
the stream writer for the `receipts` stream:
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/receipt
^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/read_markers
##### The `presence` stream
The following endpoints should be routed directly to the workers configured as
stream writers for the `presence` stream:
The following endpoints should be routed directly to the worker configured as
the stream writer for the `presence` stream:
^/_matrix/client/(api/v1|r0|v3|unstable)/presence/