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Currently we never write to streams from workers, but that will change soon
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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.
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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.
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By running this stuff with `run_in_background`, it won't be correctly reported
against the relevant CPU usage stats.
Fixes #7202
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* Remove `conn_id` usage for UserSyncCommand.
Each tcp replication connection is assigned a "conn_id", which is used
to give an ID to a remotely connected worker. In a redis world, there
will no longer be a one to one mapping between connection and instance,
so instead we need to replace such usages with an ID generated by the
remote instances and included in the replicaiton commands.
This really only effects UserSyncCommand.
* Add CLEAR_USER_SYNCS command that is sent on shutdown.
This should help with the case where a synchrotron gets restarted
gracefully, rather than rely on 5 minute timeout.
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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.
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Fix starting workers when federation sending not split out.
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This just helps keep the rows closer to their streams, so that it's easier to
see what the format of each stream is.
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`groups` != `receipts`
Introduced in #6964
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Instead of sending down batches of user ID/host tuples, send down a row
per entity (user ID or host).
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Instead lets just warn if the worker has a media listener configured but
has the media repository disabled.
Previously non media repository workers would just ignore the media
listener.
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