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From Dylan Hutchison <>
Subject Re: Accumulo Equivalent of Mongo Aggr Query
Date Sun, 25 Sep 2016 22:18:46 GMT
Hi Yamini,

Could you further describe the computation you have in mind, for those of
us not familiar with MongoDB's "Aggr" function?  You may want to look at
Accumulo's built-in Combiner iterators
<>.  They
seem more relevant than Filters.

I don't know what you mean when you write that your output is not visible
to "the complete Database".

Regards, Dylan

On Sun, Sep 25, 2016 at 11:34 AM, Yamini Joshi <>

> Hello everyone
> I wanted to know if there is any equivalent of Mongo Aggr queries in
> Acuumulo. I have a complex query in form of a Mongo aggregate
> (multi-staged) query. I'm trying to model the same in Accumulo. As of know,
> with the limited knowledge that I have, I have created a class extending
> Filter class. My question is: since my queries depend on a input, is there
> any other way of using the iterators/filters only for one query or change
> their input with every single query? As of now, my filter is getting
> attached to the table on 'SCAN' that means the output will be visible to
> the subsequent queries and not the complete Database.
> Best regards,
> Yamini Joshi

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