Following up on Alex's comments - If you know which bytes you need to slice, you can store this in a secondary index. You can perform range queries across secondary indices (as well as keys).
As long as you're storing your data in a way that allows it to be read by either Erlang or JavaScript, you should be able to query over it in MapReduce. This is typically regarded as a Bad Idea™ since an MR query will need to scan all keys in a bucket (which effectively means scanning the entire cluster) and is best done as an infrequent activity to transform data. --- Jeremiah Peschka - Founder, Brent Ozar Unlimited MCITP: SQL Server 2008, MVP Cloudera Certified Developer for Apache Hadoop On Tue, Jul 16, 2013 at 3:45 PM, Alexander Sicular <sicul...@gmail.com>wrote: > I would say no. Riak is generally oblivious as to the content of your > data. Any ranges or other method you would use to query needs to be > explicitly indexed via riak search or secondary indexes. Once you have > found your data you could operate over that data in a map reduce, but I > can't speak to "binary safe" blob operations in either erlang or JavaScript > although I'm inclined to say yes, you would be able to operate over it in > m/r. > > So searching for keys with certain data in the binblob is probably not > gonna happen but once you have a key to feed an m/r you could get a slice > of that value. > > Make sense? > -Alexander > > @siculars > http://siculars.posthaven.com > > Sent from my iRotaryPhone > > On Jul 16, 2013, at 18:17, gbrits <gbr...@gmail.com> wrote: > > > First, hello all! > > > > Coming from Redis, I love that you can just put any binary blob in Redis > > which is just treated as a string. This is possible because Redis strings > > are what they call 'binary safe'. This makes it possible to return > slices of > > string-encoded binary data, which is super useful for bitset-operations, > > etc. > > > > I'm investigating Riak and I like it a lot so far. Riak seems to have > range > > queries (on values, as it seems I must make that distinction with > > column-stores), but I'm not sure if strings in Riak are "Binary safe" in > the > > above sense. If not, is there another way to store binary data in Riak > and > > still do range queries over them quickly? > > > > To be exact: I want to do multi-key lookups in Riak, where each returned > > result should be of format: <key,slice(featureX,start,end)> > > > > Thanks, > > Geert-Jan > > > > > > > > -- > > View this message in context: > http://riak-users.197444.n3.nabble.com/Does-Riak-support-Range-Queries-over-binary-safe-strings-tp4028356.html > > Sent from the Riak Users mailing list archive at Nabble.com. > > > > _______________________________________________ > > riak-users mailing list > > riak-users@lists.basho.com > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >
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