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Added an important point on failover 

Honestly, active-passive stateful systems are terrible. Never have found one that worked, there's always too much data incongruency or other random errors. Stateless applications, like routers, are great. But not your Jenkins master.
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bowiz2 2020-05-21 08:52:00 +03:00 committed by GitHub
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@ -518,6 +518,7 @@ Active-active failover can also be referred to as master-master failover.
* Fail-over adds more hardware and additional complexity.
* There is a potential for loss of data if the active system fails before any newly written data can be replicated to the passive.
* A stateful system that does not have built-in support for Active-Passive failover will usually not work as expected if an external tool is used to facilitate failover.
### Replication