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From Jim Ancona <...@anconafamily.com>
Subject Re: Secondary Indexes, Quorum and Cluster Availability
Date Thu, 07 Jun 2012 21:43:33 GMT
On Thu, Jun 7, 2012 at 5:41 AM, aaron morton <aaron@thelastpickle.com>wrote:

> Sounds good. Do you want to make the change ?
>
Done.

>
> Thanks for taking the time.
>
Thanks for giving the answer!

Jim


>
> -----------------
> 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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