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https://issues.apache.org/jira/browse/CASSANDRA-9282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537954#comment-14537954
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Aleksey Yeschenko commented on CASSANDRA-9282:
----------------------------------------------

FWIW we do that because two keyspaces can have different replication strategies 
and strategy options, and there really is no way to merge them further.

It's not a big deal IRL, b/c it's very rare to mix updates to different 
keyspaces.

> Warn on unlogged batches
> ------------------------
>
>                 Key: CASSANDRA-9282
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9282
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>            Reporter: Jonathan Ellis
>            Assignee: T Jake Luciani
>             Fix For: 2.1.x
>
>
> At least until CASSANDRA-8303 is done and we can block them entirely, we 
> should log a warning when unlogged batches across multiple partition keys are 
> used.  This could either be done by backporting NoSpamLogger and blindly 
> logging every time, or we could add a threshold and warn when more than 10 
> keys are seen.



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