Marcel Reutegger commented on OAK-6366:

Either the system should refuse to start with this configuration or fall back 
to a local read concern. I slightly prefer the first because the fallback isn't 
a recommended configuration.

> Detect unsupported combination of read and write concern
> --------------------------------------------------------
>                 Key: OAK-6366
>                 URL: https://issues.apache.org/jira/browse/OAK-6366
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: mongomk
>            Reporter: Marcel Reutegger
>            Priority: Minor
>             Fix For: 1.8
> With OAK-4069 Oak will try to use a majority read concern when connected to a 
> replica set. The implementation should be more careful when setting a 
> majority read concern automatically and take the write concern into account. 
> It is currently possible to end up with a system that has a user configured 
> write concern of 1 and a majority read concern. This results in a 
> non-functional system and should be prevented.

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