Hi, 

I would look at data sketches as potentially a better alternative, with the 
recent release of "Numeric quantiles sketch aggregator" (As noted in the 
release notes: https://github.com/apache/incubator-druid/releases/druid-0.12.0).

Unfortunately, the documentation wasn't ready with that release, thus is not 
available on the public website yet. It is marked to be released on the next 
major milestone (0.13.0) and viable on the Druid master branch: 
https://github.com/apache/incubator-druid/blob/master/docs/content/development/extensions-core/datasketches-quantiles.md


On 2018/08/31 10:13:56, Abhishek Kaushik <akaushik...@gmail.com> wrote: 
> Hi,
> 
> I wanted to know which algorithm/s druid uses to compute percentile values.
> I came across this doc:
> http://druid.io/docs/latest/development/extensions-core/approximate-histograms.html
> but it mentions that there are "no formal error bounds on the
> approximation". So, just want to know what all options are available if one
> wishes to compute percentiles?
> 
> Thanks in advance.
> 

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