I would check the coverage plans that are being used for the different queries, 
which you can usually see in the headers of the resulting document.  When you 
run a search query though yokozuna, it will use a coverage plan from riak core 
to find a minimal set of nodes (and partitions) to query to get a set of 
results, and the coverage plan may change every few seconds.  You might be 
hitting nodes that have inconsistencies or are in need of repair.  Do you have 
AAE enabled?

-Fred

> On Feb 26, 2016, at 8:36 AM, Oleksiy Krivoshey <oleks...@gmail.com> wrote:
> 
> Hi!
> 
> Riak 2.1.3
> 
> Having a stable data set (no documents deleted in months) I'm receiving 
> inconsistent search results with Yokozuna. For example first query can return 
> num_found: 3000 (correct), the same query repeated in next seconds can return 
> 2998, or 2995, then 3000 again. Similar inconsistency happens when trying to 
> receive data in pages (using start/rows options): sometimes I get the same 
> document twice (in different pages), sometimes some documents are missing 
> completely.
> 
> There are no errors or warning in Yokozuna logs. What should I look for in 
> order to debug the problem?
> 
> Thanks!
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> riak-users@lists.basho.com
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