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Remove usage of "conn_id" for presence. (#7128)

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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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Erik Johnston 2020-03-30 16:37:24 +01:00 • committed by GitHub
parent 07569f25d1
commit 4f21c33be3
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9 changed files with 86 additions and 22 deletions
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docs/tcp_replication.md
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@ -198,6 +198,12 @@ Asks the server for the current position of all streams.
A user has started or stopped syncing
#### CLEAR_USER_SYNC (C)
The server should clear all associated user sync data from the worker.
This is used when a worker is shutting down.
#### FEDERATION_ACK (C)
Acknowledge receipt of some federation data