Colin, I believe the link phase is just a prebuilt map phase, and the
link data is available to your own MR jobs to do whatever you like with.
- John
Sent from my iPhone
On Apr 12, 2010, at 8:26 PM, Colin Surprenant <[email protected]>
wrote:
Thanks for the info. This is what I understood from the doc, the
examples and the tests I did. I was wondering if there was something I
was missing to be able to traverse a complete graph using a simple
call.
I don't know how the mapreduce link query is actually executed in the
mapreduce engine, if its distributed (i think not) but, AFAIK a
function cannot be defined, only patterns. Only the map and reduce
queries can have functions. Unless we can find a way to daisychain
mapreduce jobs for each link step? Otherwise, traversal can be done at
the application level I guess, requiring new mapreduce for each "next"
link.
But it would be really nice to be able to run a mapreduce job over a
complete graph defined with links.
Thanks,
Colin
On Mon, Apr 12, 2010 at 5:18 PM, Alexander Sicular
<[email protected]> wrote:
Colin,
Link walking http calls are non exhaustive. So if you wanted to
follow, for example, two levels of depth you would have to do
something like:
http://localhost:8098/raw/bucket/key/_,_,_/_,_,_
Check here, http://blog.basho.com/2010/02/24/link-walking-by-
example/, and here, https://wiki.basho.com/display/RIAK/REST+API#RESTAPI-Linkwalking
, if you haven't already.
Otherwise you need to build your own recursive function. I'm not
exactly sure what that would look like in Riak M/R.
-Alexander
On Apr 12, 2010, at 5:07 PM, Colin Surprenant wrote:
Hi,
If I create a linked list of many items (unknown size) in a bucket,
for example, item1 links to item2, item2 links to item3, and so
on, is
there a way to retrieve the complete set of items in a single
link-walking query or mapreduce query??
It looks like it only gathers the item direct childs and not the
whole graph.
Thanks for your help,
Colin
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