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https://issues.apache.org/jira/browse/CASSANDRA-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081854#comment-13081854
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Sylvain Lebresne commented on CASSANDRA-2990:
---------------------------------------------

bq. Why can't we hint the first replica?

Well, actually I think we could. Or at least if we cannot I forgot why. We 
would need to be sure we never replay an hint twice though, which I'm not sure 
is a guarantee right now. Also, we can only make this if what we store as a 
hint is the serialized mutation (in this case, the serialized CounterMutation): 
we can't apply the CounterMutation on a non-replica (partly because that would 
potentially increase the counter context too much, partly because counter 
remove suck, which would probably be a problem at some point).

So it should be doable, but it's a bit of work.

> We should refuse query for counters at CL.ANY
> ---------------------------------------------
>
>                 Key: CASSANDRA-2990
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2990
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.8.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Trivial
>              Labels: counters
>             Fix For: 0.8.4
>
>         Attachments: 2990.patch
>
>
> We currently do not reject writes for counters at CL.ANY, even though this is 
> not supported (and rightly so).

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