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Date: Fri, 08 Nov 2013 10:52:29 -0500
From: Chris Burroughs <chris.burroughs@gmail.com>
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Subject: Re: Why truncate previous hints when upgrade from 1.1.9 to 1.2.6?
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NEWS.txt has some details and suggested procedures

     - The hints schema was changed from 1.1 to 1.2. Cassandra automatically
       snapshots and then truncates the hints column family as part of
       starting up 1.2 for the first time.  Additionally, upgraded nodes
       will not store new hints destined for older (pre-1.2) nodes. It is
       therefore recommended that you perform a cluster upgrade when all
       nodes are up. Because hints will be lost, a cluster-wide repair (with
       -pr) is recommended after upgrade of all nodes.

On 11/07/2013 07:33 AM, Boole.Z.Guo (mis.cnsh04.Newegg) 41442 wrote:
> Hi all,
> When I upgrade C* from 1.1.9 to 1.2.6, I notice that the previous hintscolumnfamily would be directly truncated.
> Can you tell me why ?
> Because consistency is important to my services.
>
>
> Best Regards,
> Boole Guo
>