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https://issues.apache.org/jira/browse/CASSANDRA-3868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214949#comment-13214949
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Jonathan Ellis commented on CASSANDRA-3868:
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bq. the probability that you're going to be adding a node in a small time 
window of running with ROW set to off, seems much smaller than the probability 
that you have to e.g. replace a node due to a bad disk

But isn't the main rationale for keeping the option that you're undercapacity?  
And the main fix to undercapacity being adding more capacity?  I can see this 
biting people really really easily.
                
> Remove or nullify replicate_on_write option
> -------------------------------------------
>
>                 Key: CASSANDRA-3868
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3868
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8.0
>            Reporter: Brandon Williams
>             Fix For: 1.1.0
>
>         Attachments: 3868.txt
>
>
> My understanding from Sylvain is that setting this option to false is rather 
> dangerous/stupid, and you should basically never do it.  So 1.1 is a good 
> time to get rid of it, or make it a no-op.

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