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From Yamini Joshi <>
Subject Re: Indexing Column Values in Accumulo
Date Mon, 10 Oct 2016 15:01:19 GMT
I guess there is no other way. Also, once I get the rowIDs, I need to do
further filtering. Do the filters parse an entire record? My use case is to
select rowIds with a cf|cq value (given a list of values(cqs)). In other
words, the filter will have to access all the cf|cqs, right?

Best regards,
Yamini Joshi

On Mon, Oct 10, 2016 at 5:09 AM, vaibhav thapliyal <> wrote:

> 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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