Link walking example on basho blog....

Dan Young danoyoung at
Sat Feb 27 09:56:20 EST 2010

Thanx Preston,

Sean mentioned too that  the

"The three pieces of the spec are:

* bucket (only match things in this bucket)
* tag
* keep (whether to return results from this spec)"

Thanx guys.  Feel a bit stupid for asking.... :)

I'm really looking forward to riak  and getting ride of our SQL
implementations ;)  and I think this is the right ticket....



On Fri, Feb 26, 2010 at 10:55 PM, Preston Marshall
<preston at> wrote:
> The underscore means match all I think, or ignore.  Each one of the
> underscores is kind of an argument to the mapreduce/linking phase.  For
> example "http://localhost:8098/raw/hb/first/_,foo,_" means follow all links
> that are tagged "foo" in the "first" object in the hb bucket. Some of the
> others are a little more complex, like a bucket within a bucket etc. Maybe
> someone who knows more about it can chime in ;)
> On Feb 26, 2010, at 11:48 PM, Dan Young wrote:
> I'm trying to wrap my head around the url syntax for the underscores
> in the various link walking examples, both on the basho blog and in
> the various docs....Can someone clarify for me the meaning of the
> series of underscores and commas? ( _ , _)  On the basho blog, Link
> Walking By Example article,  why are there sometimes a series of three
> (i.e. $ curl http://localhost:8098/raw/hb/first/_,_,_ ) and later in
> the article there's a set of three (i.e. $ curl
> http://localhost:8098/raw/hb/first/_,_,_/_,_,_ )  This may be obvious
> but I don't get it right now...I have gotten the link walking working
> in my own test application, mostly from the examples, but I really
> don't understand the _, it an Erlang thing?
> Any insight would be greatly appreciated.
> Regards,
> Dan
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