What should I change to fix following error: I\'m trying to start a job on Elastic Mapreduce, and it crashes every time with message:
I\'m trying out the mapreduce framework from (http://code.google.com/p/appengine-mapreduce/) and modified the demo application a bit (use the mapreduce.input_readers.DatastoreInputReader instead of ma
Recently I was asked how to deal with unbalanced input of reduce task. I thought for while and try to redistribute the data, but didn\'t come up with a goo开发者_运维知识库d solution. Any advice?Actua
Say I have a collection of \'activities\', each of which has a name, cost and location: {_id : 1 , name: \'swimming\', cost: \'3.40\', location: \'kirkstall\'}
I have a map reduce like this: map: function() { emit(this.username, {sent:this.sent, received:this.received});
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this po
I\'ve got 4 mongodb slaves off of a master,and running a map reduce frequently on data in an enslaved model seems to favor the first slave by a factor of 5开发者_如何学Gox.
the map reduce examples I see use aggregation functions like count, but what 开发者_StackOverflowis the best way to get say the top 3 items in each category using map reduce.
I wrote a relatively simple map-reduce program in Hadoop platform (cloudera distribution). Each Map & Reduce write some diagnostic information to standard ouput besides the regular map-reduce task
The input file to my hadoop M/R job is a text file in which the records are separated by tab character \'\\t\' instead of newline \'\\n\'. How can I instruct hadoop to split using the tab character as
加载中,请稍侯......