Rajeshbabu is working on HBASE-10222 which adds support of secondary index to 
HBASE core. 

FYI 

On Dec 22, 2013, at 2:11 AM, Henning Blohm <henning.bl...@zfabrik.de> wrote:

> Lately we have added a secondary index feature to a persistence tier over 
> HBASE. Essentially we implemented what is described as "Dual-Write Secondary 
> Index" in http://hbase.apache.org/book/secondary.indexes.html. I.e. while 
> updating an entity, actually before writing the actual update, indexes are 
> updated. Lookup via the index ignores stale entries. A recurring rebuild and 
> clean out of stale entries takes care the indexes are trimmed and accurate.
> 
> None of this was terribly complex to implement. In fact, it seemed like 
> something you could do generically, maybe not on the HBASE level itself, but 
> as a toolbox / utility style library.
> 
> Is anybody on the list aware of anything useful already existing in that 
> space?
> 
> Thanks,
> Henning Blohm
> 
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