http://stackoverflow.com/questions/16359656/riak-map-reduce-in-js-returning-limited-data
I am trying to understand the re-reduce aspect with Riak. Riak reduces
mapped data in stages/batches (default:20) and apparently the reduce
function needs to take this into account.
After much googling I have not found any examples of "js/python re-reduce
in action".
The input bucket has over 100 keys but after the reduce function the result
has only 2 values.
This has been attributed to the reduce needing to be run multiple times and
"*Every iteration gets a batch of results from preceding phase together
with any output from earlier reduce phase iteration(s).*"
What does JS/Python code for re-reduce look like and how do I need to
change the bit below.
thanks
Code for Map/Reduce does not work:
import riak
client = riak.RiakClient()
query = riak.RiakMapReduce(client).add('raw_hits10')
query.map("""function(v) {
var data = JSON.parse(v.values[0].data);
return [[data, 1]];
}""")
query.reduce("""function(vk, arg) {
var res = {};
for (var indx in vk) {
var key_t = vk[indx][0];
var val_t = vk[indx][1];
res[key_t] = vk[indx];
}
return [res]
}
""")
for res in query.run():
print res
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