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From vaibhav thapliyal <>
Subject Re: Indexing Column Values in Accumulo
Date Mon, 10 Oct 2016 10:09:46 GMT
Creating an Inverted Index could serve your use case. You can store the
column family and column qualifier both in the row of the index table
separated by a delimiter.

For eg cf|cq

And then perform queries on just the row id to get a low query time.

On 29 September 2016 at 11:03, Josh Elser <> wrote:

> Hi Yamini,
> You're right that a filter would have to exhaustively search a table to
> find all rows that contain a certain family and qualifier. If you
> explicitly know the rows that you want to search, this is a fast operation.
> Have you considered creating an inverted index? This would be a table that
> you have to maintain on your own. Accumulo does not provide automatic index
> generation.
> - Josh
> Yamini Joshi wrote:
>> Hello everyone
>> Is there a way to easily index column fields for efficient lookups in
>> Accumulo? My use case is to select the records containing a certain
>> column family and column qualifier from among a set of column
>> qualifiers(reverse lookup). Although this could be done using a custom
>> filter, I'm looking for an optimal solution (since filter might scan the
>> entire database).
>> Best regards,
>> Yamini Joshi

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