I\'m trying to count how many开发者_如何学Go records I have located in each zip code. In my MongoDB, zip code is embedded; using dot notation, it\'s located at a.res.z(a for address, res for residenti
Google\'s Dremel is described here. What\'s the difference between Dremel and Map开发者_运维百科reduce?Dremel and MapReduce are not directly comparable, but rather they are complementary technologies.
I have a large amount of static data that needs to offer random access. Since, I\'m using Disco to digest it, I\'m using the very impressive looking Discodex (key, value) store on top of the Disco Dis
i am new to hadoop map reduce framework, and I am thinking of using hadoop map reduce to parse my data. I have thousands of big delimited files for which I am thinking of writing a map reduce job to p
I\'m using a mapreduce to do a report and I ran into a \"doc has no properties\" and I think it is because some of the document do not have the property that I am doing calculation on.
Here\'s th开发者_如何学Ce situation: I\'ve got a MongoDB cluster and a web-app, which does a pretty intensive Map/Reduce query. This query happens periodically (every 5min) in a cron job, and the resu
Is there a way开发者_JS百科 to generate permutations with MapReduce? input file: 1title1 2title2 3title3
Our organization has hundreds of batch jobs that run overnight. Many of these jobs require 2, 3, 4 hours to complete; some even require up to 7 hours. Currently, these jobs run in single-threaded mode
I have a background working with relational databases but recently started to dabble in CouchDB and was surprised by how some non-relational operations, which would be simple in SQL, were not first-cl
I set up a hadoop cluster with 4 nodes, When running a map-reduce task, the map task finishes quickly, while the reduce task hangs at 27% percent. I checked the log, it\'s that the reduce task fails t
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