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diff --git a/docs/upgrade.md b/docs/upgrade.md index 422a3da664..c6219d06e8 100644 --- a/docs/upgrade.md +++ b/docs/upgrade.md @@ -91,6 +91,21 @@ process, for example: # Upgrading to v1.67.0 +## Direct TCP replication is no longer supported: migrate to Redis + +Redis support was added in v1.13.0 with it becoming the recommended method in +v1.18.0. It replaced the old direct TCP connections (which was deprecated as of +v1.18.0) to the main process. With Redis, rather than all the workers connecting +to the main process, all the workers and the main process connect to Redis, +which relays replication commands between processes. This can give a significant +CPU saving on the main process and is a prerequisite for upcoming +performance improvements. + +To migrate to Redis add the [`redis` config](./workers.md#shared-configuration), +and remove the TCP `replication` listener from config of the master and +`worker_replication_port` from worker config. Note that a HTTP listener with a +`replication` resource is still required. + ## Minimum version of Poetry is now v1.2.0 The minimum supported version of poetry is now 1.2. This should only affect |