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https://issues.apache.org/jira/browse/CASSANDRA-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611903#comment-13611903
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Matthew F. Dennis commented on CASSANDRA-5092:
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the main reason:

short lived TTLed data when C* is used like a cache has no need for hints, 
especially with a smallish TTL and high traffic (but there are usually other 
CFs in the same cluster).

another, but less important, reason:

large but low write traffic CFs could have a substantially larger window than 
high write traffic column families (regardless of size).  repair is more 
painful on some column families than others.  


  
                
> make hinted handoff per CF configurable
> ---------------------------------------
>
>                 Key: CASSANDRA-5092
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5092
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Matthew F. Dennis
>            Priority: Minor
>
> hinted handoff should be configurable per CF (or at least per KS)

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