I get you now, I was confused by the fact that he asked explicitly about
2i, so when you mentioned indexes I thought you were referring to 2i, I
would categorize Riak Search and Yokozuna as an alternative due to extra
effort, schema definition and post-commits hooks, so for the straight
question he asked the answer would be no, the alternatives, those you
mentioned.
Guido.
On 27/07/13 17:12, Jeremiah Peschka wrote:
No, I never said or hinted that you could join 2i indices using Riak
Search.
You can, however, query against multiple indexed fields with Riak
Search. Here's what that would look like in CorrugatedIron:
varreq=newRiakSearchRequest
{
Query=newRiakFluentSearch("riak_search_bucket","date")
};
req.Query.Search("2012-01-03")
.And("category", "sandwiches");
varresult=Client.Search(req);
This becomes a Riak Search query on the riak_search_bucket with the
syntax date:2012-01-03 AND category:sandwiches
The trick with Riak Search is that the objects you're saving have to
be readable by Riak Search. If you can't encode field names in a way
that is expected by Search, you'll need to specify a search schema so
that Riak Search knows which data types to index.
See Using Search[1] and Search Schema[2] for implementation details
[1]: http://docs.basho.com/riak/latest/dev/using/search/
[2]: http://docs.basho.com/riak/latest/dev/advanced/search-schema/
---
Jeremiah Peschka - Founder, Brent Ozar Unlimited
MCITP: SQL Server 2008, MVP
Cloudera Certified Developer for Apache Hadoop
On Sat, Jul 27, 2013 at 11:44 AM, Guido Medina
<guido.med...@temetra.com <mailto:guido.med...@temetra.com>> wrote:
Are you saying that you can join two 2i indexes? Let's say you
have a 2i named "date" and another named "category" so you could
get a list of modified objects on a date and for a specific
category with Riak Search?
Guido.
On 27/07/13 16:32, Jeremiah Peschka wrote:
Both Riak Search (currently) and Yokozuna (future) provide the
ability to perform joins of multiple indices on the same bucket
objects.
I find it best to think of 2i as an extension of what Riak KV
already does well - fast key based lookups.
Search and Yokozuna provide complex query semantics.
---
Jeremiah Peschka - Founder, Brent Ozar Unlimited
MCITP: SQL Server 2008, MVP
Cloudera Certified Developer for Apache Hadoop
On Sat, Jul 27, 2013 at 11:16 AM, Guido Medina
<guido.med...@temetra.com <mailto:guido.med...@temetra.com>> wrote:
Rohman,
I think the reason for this is that the cluster will have to
do the whole intersection in memory, 2i only provides queries
for 1 single index and then return that result to either the
client streaming or not, intersection indeed will require a
MapReduce job to get a hold of both lists and intersect it,
honestly, I wish that was possible, I think that's why I'm
learning Erlang at the moment, we all wanted "join" like
functionality with 2i to be honest but I don't think that is
going to happen before version 1.5 if ever.
If you noticed, Riak 1.4 added 2i streaming which IMHO is
like moving farer away from handling results in memory, if
you get the point of what I mean. Join 2i queries in Riak
will be an issue for a long time.
HTH,
Guido.
On 27/07/13 14:20, Antonio Rohman Fernandez wrote:
Hi there,
I didn't fully check the new release notes yet, but I
guess that Riak 1.4 doesn't have the ability to query
multiple 2i at the same time... how difficult may be to
implement a multiple 2i query via their intersecting
items in their arrays? Maybe we could have this in future
versions?
I normally do this with scripts before doing a MapReduce,
if the data I want to look for is having 2 indexes
conditions, I get the array of items of each 2i query,
then get only the items found on both arrays and use it
as a MapReduce input list.
However, done in my app's side is a bit costly as Riak
needs to give me the full items arrays and then I need to
process them to find repeated keys.
I really wish for Riak to be able to query multiple 2i
soon as it will help a lot.
Merci,
Rohman
Sent from my iPhone
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