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From aaron morton <aa...@thelastpickle.com>
Subject Re: Secondary Indexes, Quorum and Cluster Availability
Date Thu, 07 Jun 2012 09:41:19 GMT
Sounds good. Do you want to make the change ? 

Thanks for taking the time. 


-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 7/06/2012, at 7:54 AM, Jim Ancona wrote:

> On Tue, Jun 5, 2012 at 4:30 PM, Jim Ancona <jim@anconafamily.com> wrote:
> It might be a good idea for the documentation to reflect the tradeoffs more clearly.
> 
> Here's a proposed addition to the Secondary Index FAQ at http://wiki.apache.org/cassandra/SecondaryIndexes
> 
> Q: How does choice of Consistency Level affect cluster availability when using secondary
indexes?
> A: Because secondary indexes are distributed, you must have CL level nodes available
for all token ranges in the cluster in order to complete a query. For example, with RF = 3,
when two out of three consecutive nodes in the ring are unavailable, all secondary index queries
at CL = QUORUM will fail, however secondary index queries at CL = ONE will succeed. This is
true regardless of cluster size.
> 
> Comments?
> 
> Jim


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