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https://issues.apache.org/jira/browse/JAMES-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17138279#comment-17138279
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Matthieu Baechler commented on JAMES-3224:
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> But eg LOCAL_QUORUM with SERIAL makes no sense.

> QUORUM with LOCAL_SERIAL also.

I would agree, yes. Either we think it should be forbidden and we can add a 
configuration check to break at start or we just want to warn because we want 
people to be able things we don't anticipate.

But implicit choice sounds bad

> Make Cassandra Consistency levels configurable
> ----------------------------------------------
>
>                 Key: JAMES-3224
>                 URL: https://issues.apache.org/jira/browse/JAMES-3224
>             Project: James Server
>          Issue Type: Improvement
>          Components: cassandra
>            Reporter: Gautier DI FOLCO
>            Priority: Minor
>
> Consistency level in Cassandra queries is set explicitly to QUORUM in some 
> cases, and to SERIAL in some other cases (lightweight transactions).
> The goal is to make these queries globally configurable.
> In the {{cassandra.properties}} file, I propose we add two configuration 
> properties:
>  * {{cassandra.consistency_level.regular}} (default to QUORUM to avoid 
> breaking changes)
>  * {{cassandra.consistency_level.lightweight_transaction}} (default to SERIAL)



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