KeyFilters filter by the key you use to identify it in Riak. That is to say the key in key-value.
If I key my users by name and I want to find everyone named Rajat, I would perform a StartsWith KeyFilter operation to find all of those records. The downside to KeyFilters is that they must scan every record. If you are using Bitcask, this isn't as much of a problem because that can will happen in RAM. However with other back ends, that scan will have to touch disk and you'll pay that I/O penalty. Depending on your overall data size and implemntation choices, this may or may not be a problem for you. I recommend looking into secondary indexes as well. This gives you the ability to define your own metadata however you want and use that for querying. --- Jeremiah Peschka, Managing Director, Brent Ozar PLF, LLC Microsoft SQL Server MVP On Feb 23, 2012, at 12:25 AM, Rajat Mathur <rajatmath...@gmail.com> wrote: > Can somebody tell me how to use KeyFilters [with/without MapReduce ] like, > > LogicalAndFilter,GreaterThanFilter, StartsWithFilter etc.. > > I am not able to get on what key-values do they Filter on ?? > > -- > Rajat Mathur > B.Tech (IT) Final Year > IIIT Allahabad > > 09945990291 > > Find me @ Facebook > Follow me @ Twitter > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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