Helix Core Server Administrator Guide: Multi-Site Deployment (2019.2)
Upgrading services
Servers, brokers, and proxies must be at the same release level. When upgrading:
- Shut down the furthest-upstream service or commit server and permit the system to quiesce.
- Upgrade downstream services first, starting with the replica that is furthest downstream, working upstream towards the master or commit server.
- Keep downstream services stopped until the server immediately upstream has been upgraded.
Tip
Upgrading to 2019.1 (and later) is different from previous upgrade. See Upgrading the server > From 2013.3 or later to 2019.1 (distributed environment) in Helix Core Server Administrator Guide.
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