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From Bruno Dumon <br...@outerthought.org>
Subject Re: filtering on a prefix of the row key
Date Fri, 12 Feb 2010 10:17:19 GMT
On Thu, Feb 11, 2010 at 7:41 PM, Stack <stack@duboce.net> wrote:
> On Wed, Feb 10, 2010 at 7:16 AM, Bruno Dumon <bruno@outerthought.org> wrote:
>> Hi,
>>
>> I would like a filter that accepts rows as long as the first X bytes
>> of the row key are less than or equal to a certain byte array.
>>
>
> Would an inclusivestoprow filter work for you where the stoprow is the
> 'certain byte array'?

No, since once the stoprow becomes a prefix of the row key, the
'greater than' test fails and the filter will exclude the row.

>
>> I have created a BinaryPrefixComparator. It is similar to the
>> BinaryComparator, but it only compares the part of the row key up to
>> the same length as the supplied byte array. It fits my needs exactly.
>>
>> Can I submit a patch with this comparator, or is there another way to
>> obtain the same behavior?
>>
>
> Patch welcome.  Please file a JIRA.

Done: HBASE-2211. I explained my use case there too.

>  You had to add your filter to HbaseObjectWritable?

Nope, it is only a Comparator that can be used in combination with
existing CompareFilters.

-- 
Bruno Dumon
Outerthought
http://outerthought.org/

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