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Accumulo >> mail # user >> Filtering on column qualifier

Marc Reichman 2013-08-21, 14:00
John Vines 2013-08-21, 14:49
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RE: Filtering on column qualifier
Would this require extending the BatchScanner as well to make use of the extended ColumnQualifierFilter, or could this be done with an unmodified BatchScanner?

From: John Vines [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 21, 2013 10:49 AM
Subject: Re: Filtering on column qualifier

There's no way to extend the ColumnQualietyFilter via configuration, but it sounds like you are on top of it. You just need to extend the class, possibly copy a bit of code, and change the equality check to a compareTo after converting the Strings to Doubles.

On Wed, Aug 21, 2013 at 10:00 AM, Marc Reichman <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
I have some data stored in Accumulo with some scores stored as column qualifiers (there was an older thread about this). I would like to find a way to do thresholding when retrieving the data without retrieving it all and then manually filtering out items below my threshold.

I know I can "fetch" column qualifiers which are exact.

I've seen the ColumnQualifierFilter, which I assume is what's in play when I fetch qualifiers. Is there a reasonable pattern to extend this and try to use it as a scan iterator so I can do things like "greater than" a value which will be interpreted as a Double vs. the string equality going on now?


John Vines 2013-08-22, 00:38
Marc Reichman 2013-08-22, 14:19
David Medinets 2013-08-22, 16:16
Marc Reichman 2013-08-22, 16:33
David Medinets 2013-08-22, 17:10
John Stoneham 2013-08-22, 19:09
John Vines 2013-08-22, 23:16
Marc Reichman 2013-08-22, 17:35